diff --git a/include/nana/gui/filebox.hpp b/include/nana/gui/filebox.hpp
index bce6af78..61ebdfa2 100644
--- a/include/nana/gui/filebox.hpp
+++ b/include/nana/gui/filebox.hpp
@@ -1,7 +1,7 @@
 /**
  *	Filebox
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -69,11 +69,10 @@ namespace nana
 
 
 		const ::std::string& path() const;
-		const ::std::string& file() const;
-#if defined(NANA_WINDOWS)
+		::std::string file() const;
+
 		const ::std::vector<::std::string>& files() const;
 		void allow_multi_select(bool allow);
-#endif
 
 		/// Display the filebox dialog
 		bool show() const;
diff --git a/include/nana/gui/widgets/checkbox.hpp b/include/nana/gui/widgets/checkbox.hpp
index 57239d20..1a75c91a 100644
--- a/include/nana/gui/widgets/checkbox.hpp
+++ b/include/nana/gui/widgets/checkbox.hpp
@@ -104,6 +104,7 @@ namespace drawerbase
 		struct element_tag
 		{
 			checkbox * uiobj;
+			event_handle eh_clicked;
 			event_handle eh_checked;
 			event_handle eh_destroy;
 			event_handle eh_keyboard;
diff --git a/include/nana/gui/widgets/detail/compset.hpp b/include/nana/gui/widgets/detail/compset.hpp
index 3991fe4e..8518b85c 100644
--- a/include/nana/gui/widgets/detail/compset.hpp
+++ b/include/nana/gui/widgets/detail/compset.hpp
@@ -1,6 +1,6 @@
 /*
  *	Concept of Component Set
- *	Copyright(C) 2003-2013 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0. 
  *	(See accompanying file LICENSE_1_0.txt or copy at 
@@ -60,17 +60,19 @@ namespace nana{	namespace widgets{ namespace detail
 		/// Widget scheme.
 		typedef WidgetScheme widget_scheme_t;
 
-		widget_scheme_t * wdg_scheme_ptr_{ nullptr };
+		//widget_scheme_t * wdg_scheme_ptr_{ nullptr };	//deprecated
 
 	public:
 		/// The destructor.
 		virtual ~compset_placer(){}
 
+		/*
 		/// Init the scheme pointer
-		void init_scheme(widget_scheme_t* wdg_scheme_ptr)
+		void init_scheme(widget_scheme_t* wdg_scheme_ptr)	//deprecated
 		{
 			wdg_scheme_ptr_ = wdg_scheme_ptr;
 		}
+		*/
 
 		/// Enable/Disable the specified component.
 		virtual void enable(component_t, bool) = 0;
diff --git a/include/nana/gui/widgets/group.hpp b/include/nana/gui/widgets/group.hpp
index 8a809fdd..3ca870d2 100644
--- a/include/nana/gui/widgets/group.hpp
+++ b/include/nana/gui/widgets/group.hpp
@@ -92,6 +92,9 @@ namespace nana{
 		/// Determines whether a specified option is checked, it throws an out_of_range if !(pos < number of options)
 		bool option_checked(std::size_t pos) const;
 
+		/// Change typeface of caption label ( does not effect child widgets )
+		void typeface( const nana::paint::font& font );
+
 		group& enable_format_caption(bool format);
 
 		group& collocate() noexcept;
@@ -101,7 +104,7 @@ namespace nana{
 		void field_display(const char* field_name, bool display); ///<Displays/Discards an existing field.
 		bool field_display(const char* field_name) const;	///<Determines whether the specified field is displayed.
 		void erase(window handle);				///< Erases a window from field.
-		
+
 		template<typename Widget, typename ...Args>
 		Widget* create_child(const char* field, Args && ... args)
 		{
diff --git a/include/nana/gui/widgets/listbox.hpp b/include/nana/gui/widgets/listbox.hpp
index d5bb0607..b6279630 100644
--- a/include/nana/gui/widgets/listbox.hpp
+++ b/include/nana/gui/widgets/listbox.hpp
@@ -1,7 +1,7 @@
 /**
  *	A List Box Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0. 
  *	(See accompanying file LICENSE_1_0.txt or copy at 
@@ -1461,7 +1461,19 @@ the nana::detail::basic_window member pointer scheme
 		/// Returns the number of columns
 		size_type column_size() const;
 
-		void column_resizable(bool resizable);
+		/// Move column to view_position
+		void move_column(size_type abs_pos, size_type view_pos);
+
+        /// Sort columns in range first_col to last_col inclusive using the values from a row
+        void reorder_columns(size_type first_col,
+							 size_type last_col,
+							 index_pair row, bool reverse,
+							 std::function<bool(const std::string &cell1, size_type col1,
+												const std::string &cell2, size_type col2,
+												const nana::any *rowval,
+												bool reverse)> comp);
+
+        void column_resizable(bool resizable);
 		bool column_resizable() const;
 		void column_movable(bool);
 		bool column_movable() const;
@@ -1517,7 +1529,8 @@ the nana::detail::basic_window member pointer scheme
 		
 		///Sets a strict weak ordering comparer for a column
 		void set_sort_compare(	size_type col,
-								std::function<bool(const std::string&, nana::any*, const std::string&, nana::any*, bool reverse)> strick_ordering);
+								std::function<bool(const std::string&, nana::any*,
+								                   const std::string&, nana::any*, bool reverse)> strick_ordering);
 
 		/// sort() and ivalidate any existing reference from display position to absolute item, that is: after sort() display offset point to different items
 		void sort_col(size_type col, bool reverse = false);
@@ -1538,6 +1551,7 @@ the nana::detail::basic_window member pointer scheme
 
 		void enable_single(bool for_selection, bool category_limited);
 		void disable_single(bool for_selection);
+		bool is_single_enabled(bool for_selection) const noexcept;	///< Determines whether the single selection/check is enabled.
 		export_options& def_export_options();
 
 
diff --git a/include/nana/gui/widgets/slider.hpp b/include/nana/gui/widgets/slider.hpp
index 8ce9602b..2fc015ce 100644
--- a/include/nana/gui/widgets/slider.hpp
+++ b/include/nana/gui/widgets/slider.hpp
@@ -151,7 +151,13 @@ namespace nana
 		bool vertical() const;
 		void maximum(unsigned);
 		unsigned maximum() const;
-		void value(unsigned);
+
+		/** Set slider value
+            @param[in] v new value for slider.
+            v will be clipped to the range 0 to maximum
+        */
+		void value(int );
+
 		unsigned value() const;
 		unsigned move_step(bool forward);                         ///< Increase or decrease the value of slider.
 		unsigned adorn() const;
diff --git a/include/nana/gui/widgets/treebox.hpp b/include/nana/gui/widgets/treebox.hpp
index 4ff78e99..0d78bbde 100644
--- a/include/nana/gui/widgets/treebox.hpp
+++ b/include/nana/gui/widgets/treebox.hpp
@@ -1,7 +1,7 @@
 /**
  *	A Tree Box Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0. 
  *	(See accompanying file LICENSE or copy at 
diff --git a/source/gui/detail/native_window_interface.cpp b/source/gui/detail/native_window_interface.cpp
index fcf7f695..cf01e33d 100644
--- a/source/gui/detail/native_window_interface.cpp
+++ b/source/gui/detail/native_window_interface.cpp
@@ -1,7 +1,7 @@
 /*
  *	Platform Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -29,6 +29,7 @@
 
 #include "../../paint/image_accessor.hpp"
 
+
 namespace nana{
 	namespace detail{
 
@@ -199,7 +200,7 @@ namespace nana{
 		namespace x11_wait
 		{
 			static Bool configure(Display *disp, XEvent *evt, char *arg)
-			{    
+			{
 			    return disp && evt && arg && (evt->type == ConfigureNotify) && (evt->xconfigure.window == *reinterpret_cast<Window*>(arg));
 			}
 
@@ -1019,15 +1020,11 @@ namespace nana{
 			auto const owner = restrict::spec.get_owner(wd);
 			if(owner && (owner != reinterpret_cast<native_window_type>(restrict::spec.root_window())))
 			{
-				auto origin = window_position(owner);
-#if 0
-				x += origin.x;
-				y += origin.y;
-#else
-				auto owner_extents = window_frame_extents(owner);
-				x += origin.x + owner_extents.left;
-				y += origin.y + owner_extents.top;
-#endif
+				int origin_x, origin_y;
+				Window child_useless_for_API;
+				::XTranslateCoordinates(disp, reinterpret_cast<Window>(owner), restrict::spec.root_window(), 0, 0, &origin_x, &origin_y, &child_useless_for_API);
+				x += origin_x;
+				y += origin_y;
 			}
 
 			::XMoveWindow(disp, reinterpret_cast<Window>(wd), x, y);
@@ -1074,7 +1071,6 @@ namespace nana{
 			XSizeHints hints;
 			nana::detail::platform_scope_guard psg;
 
-
 			//Returns if the requested rectangle is same with the current rectangle.
 			//In some X-Server versions/implementations, XMapWindow() doesn't generate
 			//a ConfigureNotify if the requested rectangle is same with the current rectangle.
@@ -1114,11 +1110,11 @@ namespace nana{
 			auto const owner = restrict::spec.get_owner(wd);
 			if(owner && (owner != reinterpret_cast<native_window_type>(restrict::spec.root_window())))
 			{
-				auto origin = window_position(owner);
-
-				auto owner_extents = window_frame_extents(owner);
-				x += origin.x + owner_extents.left;
-				y += origin.y + owner_extents.top;
+				int origin_x, origin_y;
+				Window child_useless_for_API;
+				::XTranslateCoordinates(disp, reinterpret_cast<Window>(owner), restrict::spec.root_window(), 0, 0, &origin_x, &origin_y, &child_useless_for_API);
+				x += origin_x;
+				y += origin_y;
 			}
 
 			::XMoveResizeWindow(disp, reinterpret_cast<Window>(wd), x, y, r.width, r.height);
diff --git a/source/gui/filebox.cpp b/source/gui/filebox.cpp
index 43bbf2dc..a8848e1e 100644
--- a/source/gui/filebox.cpp
+++ b/source/gui/filebox.cpp
@@ -1,7 +1,7 @@
 /*
 *	Filebox
 *	Nana C++ Library(http://www.nanapro.org)
-*	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+*	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
 *
 *	Distributed under the Boost Software License, Version 1.0.
 *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -38,6 +38,8 @@
 #	include "../detail/posix/theme.hpp"
 #endif
 
+#include <iostream> //debug
+
 namespace fs = std::filesystem;
 namespace fs_ext = nana::filesystem_ext;
 
@@ -153,7 +155,7 @@ namespace nana
 		typedef treebox::item_proxy item_proxy;
 	public:
 
-		filebox_implement(window owner, mode dialog_mode, const std::string& title, bool pick_directory = false):
+		filebox_implement(window owner, mode dialog_mode, const std::string& title, bool pick_directory, bool allow_multi_select):
 			form(owner, API::make_center(owner, 630, 440)),
 			pick_directory_(pick_directory),
 			mode_(dialog_mode)
@@ -239,11 +241,42 @@ namespace nana
 			ls_file_.append_header(i18n("NANA_FILEBOX_HEADER_TYPE"), 80);
 			ls_file_.append_header(i18n("NANA_FILEBOX_HEADER_SIZE"), 70);
 
-			auto fn_sel_file = [this](const arg_mouse& arg){
-				_m_select_file(arg);
+
+			auto fn_list_handler = [this](const arg_mouse& arg){
+				if(event_code::mouse_down == arg.evt_code)
+				{
+					selection_.is_deselect_delayed = true;
+				}
+				else if(event_code::mouse_up == arg.evt_code)
+				{
+					selection_.is_deselect_delayed = false;
+#if 0
+					this->_m_delay_deselect(true);
+#endif
+					if(_m_sync_with_selection())
+						_m_display_target_filenames();
+				}
+				else if(event_code::mouse_move == arg.evt_code)
+				{
+					if(arg.left_button)
+					{
+						selection_.is_deselect_delayed = false;
+						std::cout<<"MouseMove set is_deselect_delayed = true"<<std::endl;
+					}
+				}
+				else if(event_code::dbl_click == arg.evt_code)
+					_m_click_select_file(arg);
 			};
-			ls_file_.events().dbl_click.connect_unignorable(fn_sel_file);
-			ls_file_.events().mouse_down.connect_unignorable(fn_sel_file);
+
+			ls_file_.events().dbl_click.connect_unignorable(fn_list_handler);
+			ls_file_.events().mouse_down.connect_unignorable(fn_list_handler);
+			ls_file_.events().mouse_up.connect_unignorable(fn_list_handler);
+			ls_file_.events().mouse_move.connect_unignorable(fn_list_handler);
+
+			ls_file_.events().selected.connect_unignorable([this](const arg_listbox& arg){
+				_m_select_file(arg.item);
+			});
+
 			ls_file_.set_sort_compare(0, [](const std::string& a, nana::any* fs_a, const std::string& b, nana::any* fs_b, bool reverse) -> bool
 				{
 					int dira = any_cast<item_fs>(fs_a)->directory ? 1 : 0;
@@ -327,7 +360,7 @@ namespace nana
 			tb_file_.events().key_char.connect_unignorable([this](const arg_keyboard& arg)
 			{
 				if(arg.key == nana::keyboard::enter)
-					_m_ok();
+					_m_try_select(tb_file_.caption());
 			});
 
 			//Don't create the combox for choose a file extension if the dialog is used for picking a directory.
@@ -341,11 +374,11 @@ namespace nana
 			btn_ok_.create(*this);
 			btn_ok_.i18n(i18n_eval("NANA_BUTTON_OK_SHORTKEY"));
 
-
 			btn_ok_.events().click.connect_unignorable([this](const arg_click&)
 			{
-				_m_ok();
+				_m_try_select(tb_file_.caption());
 			});
+
 			btn_cancel_.create(*this);
 			btn_cancel_.i18n(i18n_eval("NANA_BUTTON_CANCEL_SHORTKEY"));
 
@@ -377,6 +410,10 @@ namespace nana
 			}
 			else
 				caption(title);
+
+
+			if(!allow_multi_select)
+				ls_file_.enable_single(true, true);
 		}
 
 		void def_extension(const std::string& ext)
@@ -392,7 +429,7 @@ namespace nana
 			std::string dir;
 
 			auto pos = init_file.find_last_of("\\/");
-			auto file_with_path_removed = (pos != init_file.npos ? init_file.substr(pos + 1) : init_file);
+			auto filename = (pos != init_file.npos ? init_file.substr(pos + 1) : init_file);
 
 			if(saved_init_path != init_path)
 			{
@@ -400,7 +437,7 @@ namespace nana
 					saved_init_path = init_path;
 
 				//Phase 2: Check whether init_file contains a path
-				if(file_with_path_removed == init_file)
+				if(filename == init_file)
 				{
 					//Phase 3: Check whether init_path is empty
 					if(init_path.size())
@@ -414,7 +451,7 @@ namespace nana
 
 			_m_load_cat_path(dir.size() ? dir : fs_ext::path_user().native());
 
-			tb_file_.caption(file_with_path_removed);
+			tb_file_.caption(filename);
 		}
 
 		void add_filter(const std::string& desc, const std::string& type)
@@ -450,6 +487,7 @@ namespace nana
 				cb_types_.anyobj(i, v);
 		}
 
+#if 0
 		bool file(std::string& fs) const
 		{
 			if(selection_.type == kind::none)
@@ -464,6 +502,20 @@ namespace nana
 			fs = selection_.target;
 			return true;
 		}
+#endif
+		std::vector<std::string> files() const
+		{
+			if(kind::none == selection_.type)
+				return {};
+
+			auto pos = selection_.targets.front().find_last_of("\\/");
+			if(pos != selection_.targets.front().npos)
+				saved_selected_path = selection_.targets.front().substr(0, pos);
+			else
+				saved_selected_path.clear();
+
+			return selection_.targets;
+		}
 	private:
 		void _m_layout()
 		{
@@ -704,7 +756,7 @@ namespace nana
 			if(pick_directory_)
 				return is_dir;
 
-			if((is_dir || 0 == extension) || (0 == extension->size())) return true;
+			if(is_dir || (nullptr == extension) || extension->empty()) return true;
 
 			for(auto & extstr : *extension)
 			{
@@ -799,9 +851,8 @@ namespace nana
 			ls_file_.auto_draw(true);
 		}
 
-		void _m_finish(kind::t type, const std::string& tar)
+		void _m_finish(kind::t type)
 		{
-			selection_.target = tar;
 			selection_.type = type;
 			close();
 		}
@@ -881,40 +932,346 @@ namespace nana
 			return true;
 		}
 	private:
-		void _m_select_file(const arg_mouse& arg)
+		void _m_insert_filename(const std::string& name)
 		{
-			auto sel = ls_file_.selected();
-			if(sel.empty())
+			if(selection_.targets.cend() == std::find(selection_.targets.cbegin(), selection_.targets.cend(), name))
+				selection_.targets.push_back(name);
+		}
+
+		bool _m_hovered_good() const
+		{
+			auto pos = ls_file_.hovered(false);
+			if(!pos.empty())
+			{
+				item_fs mfs;
+				ls_file_.at(pos).resolve_to(mfs);
+				return !mfs.directory;
+			}
+			return false;
+		}
+
+		bool _m_has_good_select() const
+		{
+			auto selected_items = ls_file_.selected();
+			if(selected_items.size())
+			{
+				for(auto & pos : selected_items)
+				{
+					item_fs mfs;
+					ls_file_.at(pos).resolve_to(mfs);
+
+					if((mode::open_directory == mode_) || (false == mfs.directory))
+						return true;
+				}
+			}
+			return false;
+		}
+
+		bool _m_sync_with_selection()
+		{
+			if(_m_has_good_select())
+			{
+				auto selected_items = ls_file_.selected();
+				if(selected_items.size() && (selected_items.size() < selection_.targets.size()))
+				{
+					selection_.targets.clear();
+					for(auto & pos : selected_items)
+					{
+						item_fs mfs;
+						ls_file_.at(pos).resolve_to(mfs);
+
+						if((mode::open_directory == mode_) || (false == mfs.directory))
+							selection_.targets.push_back(mfs.name);
+					}
+					return true;
+				}
+			}
+			return false;
+		}
+
+		void _m_click_select_file(const arg_mouse& arg)
+		{
+			auto selected_item = ls_file_.hovered(false);
+			if(selected_item.empty())
 				return;
 
-			auto index = sel[0];
 			item_fs m;
-			ls_file_.at(index).resolve_to(m);
+			ls_file_.at(selected_item).resolve_to(m);
 
 			if(event_code::dbl_click == arg.evt_code)
 			{
-				if(m.directory)
-					_m_load_cat_path(addr_.filesystem + m.name + "/");
+				if(!m.directory)
+					_m_try_select(m.name);
 				else
-					_m_finish(kind::filesystem, addr_.filesystem + m.name);
+					_m_load_cat_path(addr_.filesystem + m.name + "/");
 			}
+#if 0
 			else
 			{
 				if((mode::open_directory == mode_) || (false == m.directory))
 				{
-					selection_.target = addr_.filesystem + m.name;
-					tb_file_.caption(m.name);
+					if(ls_file_.is_single_enabled(true) || !arg.ctrl)
+					{
+						std::cout<<"assign by click select "<<m.name<<std::endl;
+						selection_.targets = {m.name};
+					}
+					else
+					{
+						std::cout<<"insert by click select "<<m.name<<std::endl;
+						_m_insert_filename(m.name);
+					}
+					_m_display_target_filenames();
 				}
 			}
+#endif
 		}
 
+#if 0
+		void _m_delay_deselect(bool only_clear_register)
+		{
+			if(!only_clear_register)
+			{
+				std::string filename_string;
+				for(auto i = selection_.targets.cbegin(); i != selection_.targets.cend();)
+				{
+					std::filesystem::path p{*i};
+
+					auto u = std::find(selection_.delay_deselect.cbegin(), selection_.delay_deselect.cend(), p.filename().u8string());
+					if(u == selection_.delay_deselect.cend())
+					{
+						++i;
+						continue;
+					}
+					i = selection_.targets.erase(i);				
+				}
+				
+				_m_display_target_filenames();
+			}
+
+			selection_.delay_deselect.clear();		
+		}
+#endif
+
+		void _m_select_file(const listbox::item_proxy& item)
+		{
+			item_fs mfs;
+			ls_file_.at(item.pos()).resolve_to(mfs);
+
+			if(item.selected())
+			{
+				if((mode::open_directory == mode_) || (false == mfs.directory))
+				{
+					if(ls_file_.selected().size() < 2)
+						selection_.targets.clear();
+
+					std::cout<<"insert by select file:"<<mfs.name<<std::endl;
+					_m_insert_filename(mfs.name);
+				}
+			}
+			else if(_m_hovered_good() || _m_has_good_select())
+			{
+				for(auto i = selection_.targets.cbegin(); i != selection_.targets.cend();)
+				{
+					std::filesystem::path p{*i};
+					if(p.filename().u8string() == mfs.name)
+					{
+						std::cout<<"_m_select_file delay deselect = "<<selection_.is_deselect_delayed<<std::endl;
+						if(!selection_.is_deselect_delayed)
+						{
+							i = selection_.targets.erase(i);
+							continue;
+						}
+						
+		#if 0
+						selection_.delay_deselect.push_back(mfs.name);
+		#endif
+					}
+					++i;
+				}
+			}
+			_m_display_target_filenames();
+		}
+
+		void _m_display_target_filenames()
+		{
+			std::string filename_string;
+			if(selection_.targets.size() == 1)
+			{
+				filename_string = selection_.targets.front();
+			}
+			else
+			{
+				for(auto i = selection_.targets.crbegin(); i != selection_.targets.crend(); ++i)
+				{
+					std::filesystem::path p{*i};
+					if(!filename_string.empty())
+						filename_string += ' ';
+
+					filename_string += "\"" + p.filename().u8string() + "\"";
+				}
+			}
+
+			tb_file_.caption(filename_string);
+		}
+
+		std::vector<std::string> _m_strip_files(const std::string& text)
+		{
+			std::vector<std::string> files;
+			std::size_t start_pos = 0;
+			while(true)
+			{
+				while(true)
+				{
+					auto pos = text.find_first_of(" \"", start_pos);
+					if(text.npos == pos)
+					{
+						if(text.length() == start_pos)
+							return files;
+
+						return {};
+					}
+
+					start_pos = pos + 1;
+
+					if(text[pos] == '"')
+						break;
+				}
+
+				auto pos = text.find('"', start_pos);
+				if(text.npos == pos)
+					return {};
+
+				if(pos - start_pos > 0)
+					files.push_back(text.substr(start_pos, pos - start_pos));
+
+				start_pos = pos + 1;
+			}
+
+			return files;
+
+		}
+
+		void _m_try_select(const std::string& files_text)
+		{
+			selection_.targets.clear();
+			//auto file = tb_file_.caption();
+			auto targets = _m_strip_files(files_text);
+#if 1	//debug
+			std::cout<<"filebox OK: file="<<files_text<<std::endl;
+			for(auto t : targets)
+				std::cout<<"filebox OK stripped:"<<t<<std::endl;
+#endif
+			if(targets.empty())
+			{
+				//No file is selected
+				if(files_text.empty())
+					return;
+
+				targets.push_back(files_text);
+			}
+
+			internationalization i18n;
+
+			//the position of tar in targets
+			int tar_idx = -1;
+
+			//Check whether the selected files are valid.
+			for(auto tar : targets)
+			{
+				++tar_idx;
+				if(tar[0] == '.')
+				{
+					msgbox mb(*this, caption());
+					mb.icon(msgbox::icon_warning);
+					mb<<tar<<std::endl<<i18n("NANA_FILEBOX_ERROR_INVALID_FILENAME");
+					mb();
+					return;
+				}
+
+				if(tar[0] != '/')
+					tar = addr_.filesystem + tar;
+
+				auto fattr = fs::status(tar);
+				auto ftype = static_cast<fs::file_type>(fattr.type());
+
+				//Check if the selected name is a directory
+				auto is_dir = fs::is_directory(fattr);
+
+				if(!is_dir && _m_append_def_extension(tar))
+				{
+					//Add the extension, then check if it is a directory again.
+					fattr = fs::status(tar);
+					ftype = static_cast<fs::file_type>(fattr.type());
+					is_dir = fs::is_directory(fattr);
+				}
+
+				if(is_dir)
+				{
+					//Enter the directory if this is the first tar.
+					if(0 == tar_idx)
+					{
+						_m_load_cat_path(tar);
+						tb_file_.caption(std::string{});
+						return;
+					}
+
+					//Other folders are ignored
+					continue;
+				}
+
+				if(mode::write_file != mode_)
+				{
+					if(fs::file_type::not_found == ftype)
+					{
+						msgbox mb(*this, caption());
+						mb.icon(msgbox::icon_information);
+						if(mode::open_file == mode_)
+							mb << i18n("NANA_FILEBOX_ERROR_NOT_EXISTING_AND_RETRY", tar);
+						else
+							mb << i18n("NANA_FILEBOX_ERROR_DIRECTORY_NOT_EXISTING_AND_RETRY", tar);
+						mb();
+
+						return;
+					}
+				}
+				else
+				{
+					if(fs::file_type::not_found != ftype)
+					{
+						msgbox mb(*this, caption(), msgbox::yes_no);
+						mb.icon(msgbox::icon_question);
+						mb<<i18n("NANA_FILEBOX_ERROR_QUERY_REWRITE_BECAUSE_OF_EXISTING");
+						if(msgbox::pick_no == mb())
+							return;
+					}
+				}
+
+				selection_.targets.push_back(tar);
+			}
+
+			_m_finish(kind::filesystem);			
+		}
+
+#if 0
 		void _m_ok()
 		{
-			std::string tar = selection_.target;
+			selection_.targets.clear();
+			auto file = tb_file_.caption();
+			auto targets = _m_strip_files(file);
+#if 1	//debug
+			std::cout<<"filebox OK: file="<<file<<std::endl;
+			for(auto t : targets)
+				std::cout<<"filebox OK stripped:"<<t<<std::endl;
+#endif
 
-			if(selection_.target.empty())
+			//No file is selected
+			if(targets.empty())
+				return;
+
+#if 0
+			std::string tar;
+			if(selection_.targets.empty())
 			{
-				auto file = tb_file_.caption();
 				if(file.size())
 				{
 					internationalization i18n;
@@ -959,7 +1316,7 @@ namespace nana
 						{
 							msgbox mb(*this, caption());
 							mb.icon(msgbox::icon_information);
-							if(mode::open_file != mode_)
+							if(mode::open_file == mode_)
 								mb << i18n("NANA_FILEBOX_ERROR_NOT_EXISTING_AND_RETRY", tar);
 							else
 								mb << i18n("NANA_FILEBOX_ERROR_DIRECTORY_NOT_EXISTING_AND_RETRY", tar);
@@ -979,11 +1336,94 @@ namespace nana
 								return;
 						}
 					}
+
+					selection_.targets = {tar};
 				}
 			}
+#else
+			internationalization i18n;
 
-			_m_finish(kind::filesystem, tar);
+			//the position of tar in targets
+			int tar_idx = -1;
+
+			//Check whether the selected files are valid.
+			for(auto tar : targets)
+			{
+				++tar_idx;
+				if(tar[0] == '.')
+				{
+					msgbox mb(*this, caption());
+					mb.icon(msgbox::icon_warning);
+					mb<<file<<std::endl<<i18n("NANA_FILEBOX_ERROR_INVALID_FILENAME");
+					mb();
+					return;
+				}
+
+				if(tar[0] != '/')
+					tar = addr_.filesystem + tar;
+
+				auto fattr = fs::status(tar);
+				auto ftype = static_cast<fs::file_type>(fattr.type());
+
+				//Check if the selected name is a directory
+				auto is_dir = fs::is_directory(fattr);
+
+				if(!is_dir && _m_append_def_extension(tar))
+				{
+					//Add the extension, then check if it is a directory again.
+					fattr = fs::status(tar);
+					ftype = static_cast<fs::file_type>(fattr.type());
+					is_dir = fs::is_directory(fattr);
+				}
+
+				if(is_dir)
+				{
+					//Enter the directory if this is the first tar.
+					if(0 == tar_idx)
+					{
+						_m_load_cat_path(tar);
+						tb_file_.caption(std::string{});
+						return;
+					}
+
+					//Other folders are ignored
+					continue;
+				}
+
+				if(mode::write_file != mode_)
+				{
+					if(fs::file_type::not_found == ftype)
+					{
+						msgbox mb(*this, caption());
+						mb.icon(msgbox::icon_information);
+						if(mode::open_file == mode_)
+							mb << i18n("NANA_FILEBOX_ERROR_NOT_EXISTING_AND_RETRY", tar);
+						else
+							mb << i18n("NANA_FILEBOX_ERROR_DIRECTORY_NOT_EXISTING_AND_RETRY", tar);
+						mb();
+
+						return;
+					}
+				}
+				else
+				{
+					if(fs::file_type::not_found != ftype)
+					{
+						msgbox mb(*this, caption(), msgbox::yes_no);
+						mb.icon(msgbox::icon_question);
+						mb<<i18n("NANA_FILEBOX_ERROR_QUERY_REWRITE_BECAUSE_OF_EXISTING");
+						if(msgbox::pick_no == mb())
+							return;
+					}
+				}
+
+				selection_.targets.push_back(tar);
+			}
+#endif
+
+			_m_finish(kind::filesystem);
 		}
+#endif
 
 		void _m_tr_expand(item_proxy node, bool exp)
 		{
@@ -1064,7 +1504,11 @@ namespace nana
 		struct selection_rep
 		{
 			kind::t type;
-			std::string target;
+			std::vector<std::string> targets;
+#if 0
+			std::vector<std::string> delay_deselect;
+#endif
+			bool is_deselect_delayed{ false };
 		}selection_;
 
 		static std::string saved_init_path;
@@ -1099,12 +1543,9 @@ namespace nana
 		window owner;
 		bool open_or_save;
 
-#if defined(NANA_WINDOWS)
 		bool allow_multi_select;
 		std::vector<std::string> files;
-#else
-		std::string file;
-#endif
+
 		std::string title;
 		std::string path;
 		std::vector<filter> filters;
@@ -1120,8 +1561,8 @@ namespace nana
 	{
 		impl_->owner = owner;
 		impl_->open_or_save = open;
-#if defined(NANA_WINDOWS)
 		impl_->allow_multi_select = false;
+#if defined(NANA_WINDOWS)
 		auto len = ::GetCurrentDirectory(0, nullptr);
 		if(len)
 		{
@@ -1178,11 +1619,7 @@ namespace nana
 
 	filebox& filebox::init_file(const std::string& ifstr)
 	{
-#if defined(NANA_WINDOWS)
 		impl_->files = {ifstr};
-#else
-		impl_->file = ifstr;
-#endif
 		return *this;
 	}
 
@@ -1198,30 +1635,18 @@ namespace nana
 		return impl_->path;
 	}
 
-#if defined(NANA_WINDOWS)
-	const std::string& filebox::file() const
+	std::string filebox::file() const
 	{
 		if(impl_->files.empty())
-		{
-			static const std::string empty = "";
-			return empty;
-		}
-		else
-		{
-			return impl_->files.front();
-		}
+			return {};
+
+		return impl_->files.front();
 	}
 
 	const std::vector<std::string>& filebox::files() const
 	{
 		return impl_->files;
 	}
-#else
-	const std::string& filebox::file() const
-	{
-		return impl_->file;
-	}
-#endif
 
 	bool filebox::show() const
 	{
@@ -1332,7 +1757,7 @@ namespace nana
 
 #elif defined(NANA_POSIX)
 		using mode = filebox_implement::mode;
-		filebox_implement fb(impl_->owner, (impl_->open_or_save ? mode::open_file : mode::write_file), impl_->title);
+		filebox_implement fb(impl_->owner, (impl_->open_or_save ? mode::open_file : mode::write_file), impl_->title, false, impl_->allow_multi_select);
 
 		if(impl_->filters.size())
 		{
@@ -1353,27 +1778,28 @@ namespace nana
 		else
 			fb.add_filter("All Files", "*.*");
 
-		fb.load_fs(impl_->path, impl_->file);
+		fb.load_fs(impl_->path, this->file());
 
 		API::modal_window(fb);
-		if(false == fb.file(impl_->file))
+
+		fb.files().swap(impl_->files);
+		if(impl_->files.empty())
 			return false;
-		auto tpos = impl_->file.find_last_of("\\/");
-		if(tpos != impl_->file.npos)
-			impl_->path = impl_->file.substr(0, tpos);
+
+		auto tpos = impl_->files.front().find_last_of("\\/");
+		if(tpos != impl_->files.front().npos)
+			impl_->path = impl_->files.front().substr(0, tpos);
 		else
 			impl_->path.clear();
 #endif
-
 		return true;
 	}
 	
-#if defined(NANA_WINDOWS)
+
 	void filebox::allow_multi_select(bool allow)
 	{
 		impl_->allow_multi_select = allow;
 	}
-#endif
 	//end class filebox
 
 	//class directory picker
@@ -1484,17 +1910,18 @@ namespace nana
 
 #elif defined(NANA_POSIX)
 		using mode = filebox_implement::mode;
-		filebox_implement fb(impl_->owner, mode::open_directory, {}, true);
+		filebox_implement fb(impl_->owner, mode::open_directory, {}, true, false/*single select*/);
 
 		fb.load_fs(impl_->init_path, "");
 
 		API::modal_window(fb);
 
 		std::string path_directory;
-		if(false == fb.file(path_directory))
+		auto path_dir = fb.files();
+		if(path_dir.empty())
 			return {};
 
-		return path_type{path_directory};
+		return path_type{path_dir.front()};
 #endif
 	}
 }//end namespace nana
diff --git a/source/gui/widgets/checkbox.cpp b/source/gui/widgets/checkbox.cpp
index a43cd908..fc08fcac 100644
--- a/source/gui/widgets/checkbox.cpp
+++ b/source/gui/widgets/checkbox.cpp
@@ -1,7 +1,7 @@
 /*
  *	A CheckBox Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -216,6 +216,7 @@ namespace nana{ namespace drawerbase
 			{
 				e.uiobj->radio(false);
 				e.uiobj->react(true);
+				API::umake_event(e.eh_clicked);
 				API::umake_event(e.eh_checked);
 				API::umake_event(e.eh_destroy);
 				API::umake_event(e.eh_keyboard);
@@ -232,7 +233,7 @@ namespace nana{ namespace drawerbase
 
 			el.uiobj = &uiobj;
 
-			uiobj.events().checked.connect_unignorable([this](const arg_checkbox& arg)
+			el.eh_checked = uiobj.events().checked.connect_unignorable([this](const arg_checkbox& arg)
 			{
 				if (arg.widget->checked())
 				{
@@ -244,7 +245,7 @@ namespace nana{ namespace drawerbase
 				}
 			}, true);
 
-			el.eh_checked = uiobj.events().click.connect_unignorable([this](const arg_click& arg)
+			el.eh_clicked = uiobj.events().click.connect_unignorable([this](const arg_click& arg)
 			{
 				for (auto & i : ui_container_)
 					i.uiobj->check(arg.window_handle == i.uiobj->handle());
diff --git a/source/gui/widgets/group.cpp b/source/gui/widgets/group.cpp
index d4b54e27..f590a496 100644
--- a/source/gui/widgets/group.cpp
+++ b/source/gui/widgets/group.cpp
@@ -27,10 +27,11 @@
 	if(empty())	\
 		throw std::logic_error("the group is invalid");
 
-namespace nana{
+namespace nana
+{
 
-	static const char* field_title = "__nana_group_title__";
-	static const char* field_options = "__nana_group_options__";
+static const char* field_title = "__nana_group_title__";
+static const char* field_options = "__nana_group_options__";
 
 	struct group::implement
 	{
@@ -41,108 +42,109 @@ namespace nana{
 		unsigned gap{2};
 		std::string usr_div_str;
 
-		nana::size caption_dimension;
+    nana::size caption_dimension;
 
-		std::vector<std::unique_ptr<checkbox>> options;
-		radio_group * radio_logic{nullptr};
+    std::vector<std::unique_ptr<checkbox>> options;
+    radio_group * radio_logic{nullptr};
 
-		implement() = default;
+    implement() = default;
 
-		implement(window grp_panel, ::std::string titel, bool vsb, unsigned gap=2)
-			: caption (grp_panel, std::move(titel), vsb),
-			  place_content{grp_panel},
-			  gap{gap}
-		{
-		}
+    implement(window grp_panel, ::std::string titel, bool vsb, unsigned gap=2)
+        : caption (grp_panel, std::move(titel), vsb),
+          place_content{grp_panel},
+          gap{gap}
+    {
+    }
 
-		void create(window pnl)
-		{
-			caption.create(pnl);
-			caption.caption("");
-			place_content.bind(pnl);
+    void create(window pnl)
+    {
+        caption.create(pnl);
+        caption.caption("");
+        place_content.bind(pnl);
 
-			if (!radio_logic)
-				radio_logic = new radio_group;
-		}
+        if (!radio_logic)
+            radio_logic = new radio_group;
+    }
 
-		void update_div()
-		{
-			const std::size_t padding = 10;
-			caption_dimension = caption.measure(1000);
-			caption_dimension.width += 1;
+    void update_div()
+    {
+        const std::size_t padding = 10;
+        caption_dimension = caption.measure(1000);
+        caption_dimension.width += 1;
 
-			std::string div = "vert margin=[0," + std::to_string(gap) + "," + std::to_string(gap + 5) + "," + std::to_string(gap) + "]";
+        std::string div = "vert margin=[0," + std::to_string(gap) + "," + std::to_string(gap + 5) + "," + std::to_string(gap) + "]";
 
-			div += "<weight=" + std::to_string(caption_dimension.height) + " ";
+        div += "<weight=" + std::to_string(caption_dimension.height) + " ";
 
-			if (align::left == caption_align)
-				div += "<weight=" + std::to_string(padding) + ">";
-			else
-				div += "<>";	//right or center
+        if (align::left == caption_align)
+            div += "<weight=" + std::to_string(padding) + ">";
+        else
+            div += "<>";	//right or center
 
-			div += "<" + std::string{ field_title } + " weight=" + std::to_string(caption_dimension.width) + ">";
+        div += "<" + std::string{ field_title } + " weight=" + std::to_string(caption_dimension.width) + ">";
 
-			if (align::right == caption_align)
-				div += "<weight=" + std::to_string(padding) + ">";
-			else if (align::center == caption_align)
-				div += "<>";
+        if (align::right == caption_align)
+            div += "<weight=" + std::to_string(padding) + ">";
+        else if (align::center == caption_align)
+            div += "<>";
 
-			div += "><<vert margin=5 " + std::string(field_options) + ">";
+        div += "><<vert margin=5 " + std::string(field_options) + ">";
 
-			if (!usr_div_str.empty())
-				div += "<" + usr_div_str + ">>";
-			else
-				div += ">";
+        if (!usr_div_str.empty())
+            div += "<" + usr_div_str + ">>";
+        else
+            div += ">";
 
-			place_content.div(div.c_str());
+        place_content.div(div.c_str());
 
-			if (options.empty())
-				place_content.field_display(field_options, false);
+        if (options.empty())
+            place_content.field_display(field_options, false);
 
-			if (caption.caption().empty())
-				place_content.field_display(field_title, false);
-		}
-	};
+        if (caption.caption().empty())
+            place_content.field_display(field_title, false);
+    }
+};
 
-	group::group()
-		: impl_(new implement)
-	{
-	}
+group::group()
+    : impl_(new implement)
+{
+}
 
-	group::group(window parent, const rectangle& r, bool vsb)
-		: group()
-	{
-		create(parent, r, vsb);
-	}
+group::group(window parent, const rectangle& r, bool vsb)
+    : group()
+{
+    create(parent, r, vsb);
+}
 
-	using groupbase_type = widget_object<category::widget_tag, drawerbase::panel::drawer, general_events, drawerbase::group::scheme>;
+using groupbase_type = widget_object<category::widget_tag, drawerbase::panel::drawer, general_events, drawerbase::group::scheme>;
 
-	group::group(window parent, ::std::string titel, bool formatted, unsigned  gap, const rectangle& r, bool vsb)
-		: group(parent, r, vsb)
-	{
-		this->bgcolor(API::bgcolor(parent));
+group::group(window parent, ::std::string titel, bool formatted, unsigned  gap, const rectangle& r, bool vsb)
+    : group(parent, r, vsb)
+{
+    this->bgcolor(API::bgcolor(parent));
 
-		impl_.reset(new implement(*this, std::move(titel), vsb, gap));
+    impl_.reset(new implement(*this, std::move(titel), vsb, gap));
 
-		impl_->caption.format(formatted);
-		_m_init();
-	}
+    impl_->caption.format(formatted);
+    _m_init();
+}
 
-	group::~group()
-	{
-		delete impl_->radio_logic;
-	}
+group::~group()
+{
+    delete impl_->radio_logic;
+}
 
-	checkbox& group::add_option(std::string text)
-	{
-		_THROW_IF_EMPTY()
+checkbox& group::add_option(std::string text)
+{
+    _THROW_IF_EMPTY()
 
 #ifdef _nana_std_has_emplace_return_type
-		auto & opt = impl_->options.emplace_back(new checkbox{ handle() });
+    auto & opt = impl_->options.emplace_back(new checkbox { handle() });
 #else
-		impl_->options.emplace_back(new checkbox(handle()));
-		auto & opt = impl_->options.back();
+    impl_->options.emplace_back(new checkbox(handle()));
+    auto & opt = impl_->options.back();
 #endif
+
 		opt->transparent(true);
 		opt->caption(std::move(text));
 		impl_->place_content[field_options] << *opt;
@@ -358,5 +360,6 @@ namespace nana{
 		impl_->update_div();
 		impl_->place_content.collocate();
 	}
+
 }//end namespace nana
 
diff --git a/source/gui/widgets/listbox.cpp b/source/gui/widgets/listbox.cpp
index 4f93a660..13baf15a 100644
--- a/source/gui/widgets/listbox.cpp
+++ b/source/gui/widgets/listbox.cpp
@@ -1,7 +1,7 @@
 /*
  *	A List Box Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -17,6 +17,12 @@
  *		dankan1890(pr#158)
  *
  */
+#include <algorithm>
+#include <list>
+#include <deque>
+#include <stdexcept>
+#include <map>
+#include <iostream>
 
 #include <nana/gui/widgets/listbox.hpp>
 #include <nana/gui/widgets/panel.hpp>	//for inline widget
@@ -28,12 +34,6 @@
 #include <nana/system/platform.hpp>
 #include "skeletons/content_view.hpp"
 
-#include <algorithm>
-#include <list>
-#include <deque>
-#include <stdexcept>
-#include <map>
-
 namespace nana
 {
 	static void check_range(std::size_t pos, std::size_t size)
@@ -130,17 +130,18 @@ namespace nana
 				struct column
 					: public column_interface
 				{
-					native_string_type caption;
-					unsigned width_px;
-					std::pair<unsigned, unsigned> range_width_px;
+					native_string_type caption;                     //< header title
+					unsigned width_px;                              //< column width in pixels
+					std::pair<unsigned, unsigned> range_width_px;   //< allowed width
 					bool visible_state{ true };
 
-					/// Absolute position of column when it was creating
-					size_type index;
+
+					size_type index;                          //< Absolute position of column when it was created
 
 					nana::align alignment{ nana::align::left };
 
-					std::function<bool(const std::string&, nana::any*, const std::string&, nana::any*, bool reverse)> weak_ordering;
+					std::function<bool(const std::string&,  nana::any*,
+							           const std::string&,  nana::any*,        bool reverse)> weak_ordering;
 
 					std::shared_ptr<paint::font> font;	///< The exclusive column font
 
@@ -186,18 +187,18 @@ namespace nana
 					{
 					}
 				private:
-					//The definition is provided after essence
+					/// The definition is provided after essence
 					void _m_refresh() noexcept;
 				private:
 					essence* const ess_;
 				public:
-					//Implementation of column_interface
+					/// Implementation of column_interface
 					unsigned width() const noexcept override
 					{
 						return width_px;
 					}
 
-					// Sets the width and overrides the ranged width
+					/// Sets the width and overrides the ranged width
 					void width(unsigned pixels) noexcept override
 					{
 						width_px = pixels;
@@ -223,7 +224,7 @@ namespace nana
 						}
 					}
 
-					size_type position(bool disp_order) const noexcept override;	//The definition is provided after essence
+					size_type position(bool disp_order) const noexcept override;	//< The definition is provided after essence
 
 					std::string text() const noexcept override
 					{
@@ -440,7 +441,7 @@ namespace nana
 					throw std::invalid_argument("listbox: invalid header index");
 				}
 
-                /// find and return a ref to the column that originaly was at position "pos" previous to any list reorganization.
+                /// find and return a ref to the column that originally was at position "pos" previous to any list reorganization.
 				column& at(size_type pos, bool disp_order = false)
 				{
 					check_range(pos, cont_.size());
@@ -507,7 +508,7 @@ namespace nana
 					return{ left, 0 };
 				}
 
-				/// return the original index of the visible col currently before(in front of) or after the col originaly at index "index"
+				/// return the original index of the visible col currently before(in front of) or after the col originally at index "index"
 				size_type next(size_type index) const noexcept
 				{
 					bool found_me = false;
@@ -542,7 +543,25 @@ namespace nana
 					return pos;
 				}
                 
-				/// move the col originaly at "from" to the position currently in front (or after) the col originaly at index "to" invalidating some current index
+
+				/// move col to view pos
+				void move_to_view_pos (size_type col, size_type view, bool front) noexcept
+				{
+					if (!front) view++;
+					if (view >= cont_.size() )		return;
+
+					auto i = std::find_if( cont_.begin(),
+							               cont_.end(),
+							               [&](const column& c){return col==c.index;});
+
+					if (i==cont_.end()) return;
+
+					auto col_from = *i;
+					cont_.erase(i);
+					cont_.insert(cont_.begin()+ view, col_from);
+
+				}
+				/// move the col originally at "from" to the position currently in front (or after) the col originally at index "to" invalidating some current index
 				void move(size_type from, size_type to, bool front) noexcept
 				{
 					if ((from == to) || (from >= cont_.size()) || (to >= cont_.size()))
@@ -1850,6 +1869,11 @@ namespace nana
 					(for_selection ? single_selection_ : single_check_) = false;
 				}
 
+				bool is_single_enabled(bool for_selection) const noexcept
+				{
+					return (for_selection ? single_selection_ : single_check_);
+				}
+
 				size_type size_item(size_type cat) const
 				{
 					return get(cat)->items.size();
@@ -2006,6 +2030,8 @@ namespace nana
 				{
 					bool	started{ false };
 					bool	reverse_selection{ false };
+					bool	scroll_direction;
+					bool	deselect_when_start_to_move;
 
 					point	screen_pos;
 					point	begin_position;	///< Logical position to the 
@@ -2013,9 +2039,18 @@ namespace nana
 					index_pairs already_selected;
 					index_pairs selections;
 
-					bool scroll_direction;
 					unsigned scroll_step{ 1 };
 					unsigned mouse_move_timestamp{ 0 };
+
+					bool is_already_selected(const index_pair& abs_pos) const noexcept
+					{
+						return (already_selected.cend() != std::find(already_selected.cbegin(), already_selected.cend(), abs_pos));
+					}
+
+					bool is_selected(const index_pair& abs_pos) const noexcept
+					{
+						return (selections.cend() != std::find(selections.cbegin(), selections.cend(), abs_pos));
+					}
 				}mouse_selection;
 
 
@@ -2113,6 +2148,7 @@ namespace nana
 					mouse_selection.started = true;
 					mouse_selection.begin_position = logic_pos;
 					mouse_selection.end_position = logic_pos;
+					mouse_selection.deselect_when_start_to_move = true;
 
 					if (arg.ctrl || arg.shift)
 					{
@@ -2128,6 +2164,17 @@ namespace nana
 					if (!mouse_selection.started)
 						return;
 
+					// When the button is pressed and start to move the mouse, the listbox should deselect all items.
+					// But when ctrl is clicked
+					if (mouse_selection.deselect_when_start_to_move)
+					{
+						mouse_selection.deselect_when_start_to_move = false;
+						if (mouse_selection.already_selected.empty())
+							lister.select_for_all(false);
+
+						mouse_selection.selections.clear();
+					}
+
 					mouse_selection.screen_pos = screen_pos;
 
 					auto logic_pos = coordinate_cast(screen_pos, true);
@@ -2143,7 +2190,7 @@ namespace nana
 
 					mouse_selection.end_position = logic_pos;
 
-					bool cancel_selections = true;
+					std::vector<std::pair<index_pair, bool>> selections;
 
 					auto content_x = coordinate_cast({ columns_range().first, 0 }, true).x;
 					if ((std::max)(mouse_selection.end_position.x, mouse_selection.begin_position.x) >= content_x &&
@@ -2154,18 +2201,18 @@ namespace nana
 						auto begin = lister.advance(lister.first(), begin_off);
 						if (!begin.empty())
 						{
-							std::vector<std::pair<index_pair, bool>> selections;
-
 							if ((mouse_selection.end_position.y < 0) || (lister.distance(lister.first(), begin) == begin_off))
 							{
 								//The range [begin_off, last_off] is a range of box selection
 								auto last_off = (std::max)(mouse_selection.begin_position.y, mouse_selection.end_position.y) / item_height();
 								auto last = lister.advance(lister.first(), last_off);
 
+								//Tries to select the items in the box, then returns the items with their previous selected states
 								selections = lister.select_display_range_if(begin, last, false, [this](const index_pair& abs_pos) {
-									if (this->mouse_selection.reverse_selection)
+									if (mouse_selection.reverse_selection)
 									{
-										if (mouse_selection.already_selected.cend() != std::find(mouse_selection.already_selected.cbegin(), mouse_selection.already_selected.cend(), abs_pos))
+										//Deselects the items in the box which has been already selected
+										if(mouse_selection.is_already_selected(abs_pos))
 										{
 											item_proxy{ this, abs_pos }.select(false);
 											return false;
@@ -2176,21 +2223,21 @@ namespace nana
 
 								for (auto & pair : selections)
 								{
+									//Continue if the previous state is selected. It indicates the item now is not selected.
 									if (pair.second)
 										continue;
 
-									if (mouse_selection.selections.cend() ==
-										std::find(mouse_selection.selections.cbegin(), mouse_selection.selections.cend(), pair.first))
-									{
+									//Add the item to selections container.
+									if(!mouse_selection.is_selected(pair.first))
 										mouse_selection.selections.push_back(pair.first);
-									}
 								}
 
+								//Deselects the items which are in mouse_selection.selections but not in selections.
+								//Eq to mouse_selection.selections = selections
 #ifdef _MSC_VER
 								for (auto i = mouse_selection.selections.cbegin(); i != mouse_selection.selections.cend();)
 #else
 								for(auto i = mouse_selection.selections.begin(); i != mouse_selection.selections.end();)
-
 #endif
 								{
 									auto & selpos = *i;
@@ -2204,30 +2251,45 @@ namespace nana
 									else
 										++i;
 								}
-
-								cancel_selections = false;
 							}
 						}
 					}
 
-					if (cancel_selections)
+					//Restores an already selected item if it is not in selections.
+					for (auto& abs_pos : mouse_selection.already_selected)
 					{
-						if (!mouse_selection.already_selected.empty())
+						if (selections.cend() == std::find_if(selections.cbegin(), selections.cend(), [abs_pos](const std::pair<index_pair, bool>& rhs) {
+							return (abs_pos == rhs.first);
+							}))
 						{
-							for (auto & pos : mouse_selection.selections)
-								item_proxy(this, pos).select(false);
-
-							//Don't restore the already selections if it is reverse selection(pressing shift). Behaves like Windows Explorer.
-							if (!mouse_selection.reverse_selection)
+							item_proxy m{ this, abs_pos };
+							if (!m.selected())
 							{
-								for (auto & abs_pos : mouse_selection.already_selected)
-									item_proxy(this, abs_pos).select(true);
+								m.select(true);
+								//Add the item to selections container.
+								if(!mouse_selection.is_selected(abs_pos))
+									mouse_selection.selections.push_back(abs_pos);
 							}
 						}
-						else
-							lister.select_for_all(false);
+					}
 
-						mouse_selection.selections.clear();
+					//Deselects the item which is not in already_selected and selections but in mouse_selection.selections
+					for(auto i = mouse_selection.selections.cbegin(); i != mouse_selection.selections.cend();)
+					{
+						auto abs_pos = *i;
+
+						bool is_box_selected = (selections.cend() != std::find_if(selections.cbegin(), selections.cend(), [abs_pos](const std::pair<index_pair, bool>& rhs) {
+							return (abs_pos == rhs.first);
+							}));
+
+						if (is_box_selected || mouse_selection.is_already_selected(abs_pos))
+						{
+							++i;
+							continue;
+						}
+
+						item_proxy{ this, abs_pos }.select(false);
+						i = mouse_selection.selections.erase(i);
 					}
 				}
 
@@ -4110,11 +4172,13 @@ namespace nana
 					essence_->draw_peripheral();
 				}
 
+				// In mouse move event, it cancels the msup_deselect if the listbox is draggable or it started the mouse selection.
 				void trigger::mouse_move(graph_reference graph, const arg_mouse& arg)
 				{
 					using item_state = essence::item_state;
 					using parts = essence::parts;
 
+					//Don't deselect the items if the listbox is draggable
 					if ((operation_states::msup_deselect == essence_->operation.state) && API::dev::window_draggable(arg.window_handle))
 						essence_->operation.state = operation_states::none;
 
@@ -4168,6 +4232,9 @@ namespace nana
 					if (essence_->mouse_selection.started)
 					{
 						essence_->update_mouse_selection(arg.pos);
+
+						//Don't deselect items if the mouse selection is started
+						essence_->operation.state = operation_states::none;
 						need_refresh = true;
 					}
 
@@ -4364,7 +4431,7 @@ namespace nana
 						if (arg.is_left_button() && (!lister.single_status(true)))
 							essence_->start_mouse_selection(arg);
 
-						//Deselection of all items is deferred to the mouse up event when ctrl or shift is not pressed
+						//Deselecting all items is deferred to the mouse up event when ctrl or shift is not pressed
 						//Pressing ctrl or shift is to selects other items without deselecting current selections.
 						if (!(arg.ctrl || arg.shift))
 						{
@@ -4411,7 +4478,7 @@ namespace nana
 						essence_->stop_mouse_selection();
 						need_refresh = true;
 					}
-
+					
 					if (operation_states::msup_deselect == essence_->operation.state)
 					{
 						essence_->operation.state = operation_states::none;
@@ -5954,9 +6021,16 @@ namespace nana
 
 		void listbox::disable_single(bool for_selection)
 		{
+			internal_scope_guard lock;
 			_m_ess().lister.disable_single(for_selection);
 		}
 
+		bool listbox::is_single_enabled(bool for_selection) const noexcept
+		{
+			internal_scope_guard lock;
+			return _m_ess().lister.is_single_enabled(for_selection);
+		}
+
         listbox::export_options& listbox::def_export_options()
         {
 			return _m_ess().def_exp_options;
@@ -6097,5 +6171,49 @@ namespace nana
 			internal_scope_guard lock;
 			return _m_ess().content_view->scroll_operation();
 		}
+
+		/// Move column to view_position
+		void listbox::move_column(size_type abs_pos, size_type view_pos)
+		{
+			internal_scope_guard lock;
+			return _m_ess().header.move_to_view_pos(abs_pos, view_pos, true);
+			_m_ess().update();
+		}
+
+		/// Sort columns in range first_col to last_col inclusive using a row
+		void listbox::reorder_columns(size_type first_col,
+									  size_type last_col,
+									  index_pair row, bool reverse,
+									  std::function<bool(const std::string &cell1, size_type col1,
+														 const std::string &cell2, size_type col2,
+														 const nana::any *rowval,
+														 bool reverse)> comp)
+		{
+			if (first_col<0 || last_col<=first_col)
+				return;
+			if (last_col >= column_size())
+				return;
+			std::vector<size_type> new_idx;
+			for(size_type i=first_col; i<=last_col; ++i) new_idx.push_back(i);
+			
+			internal_scope_guard lock;
+			auto ip_row = this->at(row);
+			auto pnany=_m_ess().lister.anyobj(row,false);
+			std::sort(new_idx.begin(), new_idx.end(), [&](size_type col1,
+														  size_type col2)
+			{
+				return comp(ip_row.text(col1), col1,
+						    ip_row.text(col2), col2,
+						    pnany, reverse);
+			});
+
+			//Only change the view position of columns
+			for(size_t i=0; i<new_idx.size(); ++i)
+			{
+				move_column(new_idx[i],i+first_col);
+			}
+			_m_ess().update();
+		}
+
 	//end class listbox
 }//end namespace nana
diff --git a/source/gui/widgets/skeletons/text_editor.cpp b/source/gui/widgets/skeletons/text_editor.cpp
index 6a5251b4..f53a5837 100644
--- a/source/gui/widgets/skeletons/text_editor.cpp
+++ b/source/gui/widgets/skeletons/text_editor.cpp
@@ -1,7 +1,7 @@
 /*
 *	A text editor implementation
 *	Nana C++ Library(http://www.nanapro.org)
-*	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+*	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
 *
 *	Distributed under the Boost Software License, Version 1.0.
 *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -1728,7 +1728,7 @@ namespace nana {
 					str = impl_->textbase.getline(0);
 					for (std::size_t i = 1; i < lines; ++i)
 					{
-						str += L"\n\r";
+						str += L"\r\n";
 						str += impl_->textbase.getline(i);
 					}
 				}
diff --git a/source/gui/widgets/slider.cpp b/source/gui/widgets/slider.cpp
index 67a67631..572eba99 100644
--- a/source/gui/widgets/slider.cpp
+++ b/source/gui/widgets/slider.cpp
@@ -245,7 +245,7 @@ namespace nana
 				};
 			public:
 				enum class parts{none, bar, slider};
-				
+
 				using graph_reference = drawer_trigger::graph_reference;
 
 				model()
@@ -256,7 +256,7 @@ namespace nana
 					proto_.renderer = pat::cloneable<renderer_interface>{interior_renderer{}};
 
 					attr_.seek_dir = seekdir::bilateral;
-					
+
 					attr_.is_draw_adorn = false;
 					attr_.vcur = 0;
 					attr_.vmax = 10;
@@ -361,7 +361,7 @@ namespace nana
 				parts seek_where(::nana::point pos) const
 				{
 					nana::rectangle r = _m_bar_area();
-					
+
 					if (attr_.slider.vert)
 					{
 						std::swap(pos.x, pos.y);
@@ -373,7 +373,7 @@ namespace nana
 						return parts::slider;
 
 					sdpos = static_cast<int>(attr_.slider.weight) / 2;
-					
+
 					if (sdpos <= pos.x && pos.x < sdpos + static_cast<int>(r.width))
 					{
 						if(pos.y < r.bottom())
@@ -446,7 +446,7 @@ namespace nana
 				bool move_slider(const ::nana::point& pos)
 				{
 					int adorn_pos = slider_state_.snap_pos + (attr_.slider.vert ? pos.y : pos.x) - slider_state_.refpos.x;
-					
+
 					if (adorn_pos > 0)
 					{
 						int range = static_cast<int>(_m_range());
@@ -691,7 +691,7 @@ namespace nana
 					window wd;
 					nana::slider * widget;
 				}other_;
-				
+
 				struct prototype_tag
 				{
 					pat::cloneable<slider::renderer_interface> renderer;
@@ -759,9 +759,9 @@ namespace nana
 				void trigger::mouse_move(graph_reference graph, const arg_mouse& arg)
 				{
 					// check if slider is disabled
-					if(!API::get_widget(arg.window_handle)->enabled()) 
+					if(!API::get_widget(arg.window_handle)->enabled())
 						return;		// do nothing
-					
+
 					bool updated = false;
 					if (model_ptr_->if_trace_slider())
 					{
@@ -804,7 +804,7 @@ namespace nana
 
 	//class slider
 		slider::slider(){}
-		
+
 		slider::slider(window wd, bool visible)
 		{
 			create(wd, rectangle(), visible);
@@ -844,10 +844,14 @@ namespace nana
 			return get_drawer_trigger().get_model()->attribute().vmax;
 		}
 
-		void slider::value(unsigned v)
+		void slider::value(int v)
 		{
 			if(handle())
 			{
+			    // limit to positive values, vcur expects unsigned
+			    if( v < 0 )
+                    v = 0;
+
 				if(get_drawer_trigger().get_model()->vcur(v))
 					API::refresh_window(handle());
 			}
diff --git a/source/gui/widgets/spinbox.cpp b/source/gui/widgets/spinbox.cpp
index 6ed1f3ed..4a631c2c 100644
--- a/source/gui/widgets/spinbox.cpp
+++ b/source/gui/widgets/spinbox.cpp
@@ -1,7 +1,7 @@
 /*
  *	A Spin box widget
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -467,7 +467,7 @@ namespace nana
 
 					std::wstring text;
 
-					if (API::is_focus_ready(editor_->window_handle()))
+					if (API::is_focus_ready(editor_->window_handle()) && editor_->attr().editable)
 						text = to_wstring(range_->value());
 					else
 						text = to_wstring(modifier_.prefix + range_->value() + modifier_.suffix);
diff --git a/source/gui/widgets/treebox.cpp b/source/gui/widgets/treebox.cpp
index 9deb3bd2..e5be4dcd 100644
--- a/source/gui/widgets/treebox.cpp
+++ b/source/gui/widgets/treebox.cpp
@@ -1,7 +1,7 @@
 /*
  *	A Treebox Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2019 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -1330,6 +1330,10 @@ namespace nana
 			class internal_placer
 				: public compset_placer_interface
 			{
+			public:
+				internal_placer(const scheme& schm):
+					scheme_(schm)
+				{}
 			private:
 				//Implement the compset_locator_interface
 
@@ -1364,17 +1368,24 @@ namespace nana
 
 				virtual unsigned item_height(graph_reference graph) const override
 				{
-					auto m = std::max((enable_crook_ ? wdg_scheme_ptr_->crook_size : 0), (enable_icon_ ? wdg_scheme_ptr_->icon_size : 0));
+					auto m = std::max((enable_crook_ ? scheme_.crook_size : 0), (enable_icon_ ? scheme_.icon_size : 0));
+
+#if 1
+					unsigned as = 0, ds = 0, il;
+					graph.text_metrics(as, ds, il);
+					return std::max(as + ds + 8, m);
+#else
 #ifdef _nana_std_has_string_view
 					return std::max(m, graph.text_extent_size(std::wstring_view{ L"jH{", 3 }).height + 8);
 #else
 					return std::max(m, graph.text_extent_size(L"jH{", 3).height + 8);
+#endif
 #endif
 				}
 
 				virtual unsigned item_width(graph_reference graph, const item_attribute_t& attr) const override
 				{
-					return graph.text_extent_size(attr.text).width + (enable_crook_ ? wdg_scheme_ptr_->crook_size : 0) + (enable_icon_ ? wdg_scheme_ptr_ ->icon_size: 0) + (wdg_scheme_ptr_->text_offset << 1) + wdg_scheme_ptr_->item_offset;
+					return graph.text_extent_size(attr.text).width + (enable_crook_ ? scheme_.crook_size : 0) + (enable_icon_ ? scheme_.icon_size : 0) + (scheme_.text_offset << 1) + scheme_.item_offset;
 				}
 
 				// Locate a component through the specified coordinate.
@@ -1389,7 +1400,7 @@ namespace nana
 					case component_t::expander:
 						if(attr.has_children)
 						{
-							r->width = wdg_scheme_ptr_->item_offset;
+							r->width = scheme_.item_offset;
 							return true;
 						}
 						return false;
@@ -1398,26 +1409,26 @@ namespace nana
 					case component_t::crook:
 						if(enable_crook_)
 						{
-							r->x += wdg_scheme_ptr_->item_offset;
-							r->width = wdg_scheme_ptr_->crook_size;
+							r->x += scheme_.item_offset;
+							r->width = scheme_.crook_size;
 							return true;
 						}
 						return false;
 					case component_t::icon:
 						if(enable_icon_)
 						{
-							r->x += wdg_scheme_ptr_->item_offset + (enable_crook_ ? wdg_scheme_ptr_->crook_size : 0);
+							r->x += scheme_.item_offset + (enable_crook_ ? scheme_.crook_size : 0);
 							r->y = 2;
-							r->width = wdg_scheme_ptr_->icon_size;
+							r->width = scheme_.icon_size;
 							r->height -= 2;
 							return true;
 						}
 						return false;
 					case component_t::text:
 						{
-							auto text_pos = wdg_scheme_ptr_->item_offset + (enable_crook_ ? wdg_scheme_ptr_->crook_size : 0) + (enable_icon_ ? wdg_scheme_ptr_->icon_size : 0) + wdg_scheme_ptr_->text_offset;
+							auto text_pos = scheme_.item_offset + (enable_crook_ ? scheme_.crook_size : 0) + (enable_icon_ ? scheme_.icon_size : 0) + scheme_.text_offset;
 							r->x += text_pos;
-							r->width -= (text_pos + wdg_scheme_ptr_->text_offset);
+							r->width -= (text_pos + scheme_.text_offset);
 						};
 						return true;
 					default:
@@ -1426,6 +1437,7 @@ namespace nana
 					return false;
 				}
 			private:
+				const scheme& scheme_;
 				bool enable_crook_{ false };
 				bool enable_icon_{ false };
 			};
@@ -1680,7 +1692,7 @@ namespace nana
 				{
 					impl_->data.trigger_ptr = this;
 					impl_->data.renderer = nana::pat::cloneable<renderer_interface>(internal_renderer());
-					impl_->data.comp_placer = nana::pat::cloneable<compset_placer_interface>(internal_placer());
+					//impl_->data.comp_placer = nana::pat::cloneable<compset_placer_interface>(internal_placer());	//deprecated
 
 					impl_->adjust.timer.elapse([this]
 					{
@@ -1946,13 +1958,16 @@ namespace nana
 					widget.bgcolor(colors::white);
 					impl_->data.widget_ptr = static_cast<::nana::treebox*>(&widget);
 					impl_->data.scheme_ptr = static_cast<::nana::treebox::scheme_type*>(API::dev::get_scheme(widget));
-					impl_->data.comp_placer->init_scheme(impl_->data.scheme_ptr);
+					//impl_->data.comp_placer->init_scheme(impl_->data.scheme_ptr);	//deprecated
+					impl_->data.comp_placer = nana::pat::cloneable<compset_placer_interface>(internal_placer{ *impl_->data.scheme_ptr });
 
 					widget.caption("nana treebox");
 				}
 
 				void trigger::detached()
 				{
+					//Reset the comp_placer, because after deteching, the scheme refered by comp_placer will be released
+					impl_->data.comp_placer.reset();
 					impl_->data.graph = nullptr;
 				}