diff --git a/include/nana/basic_types.hpp b/include/nana/basic_types.hpp
index dc0b51a9..af9faa26 100644
--- a/include/nana/basic_types.hpp
+++ b/include/nana/basic_types.hpp
@@ -84,7 +84,7 @@ namespace nana
 
 	enum class mouse_action
 	{
-		begin, normal = begin, hovered, pressed, end
+		begin, normal = begin, normal_captured, hovered, pressed, end
 	};
 
 	enum class element_state
@@ -298,8 +298,7 @@ namespace nana
 		color(color_rgb);
 		color(color_argb);
 		color(color_rgba);
-		color(unsigned red, unsigned green, unsigned blue);
-		color(unsigned red, unsigned green, unsigned blue, double alpha);
+		color(unsigned red, unsigned green, unsigned blue, double alpha = 1.0);
 
 		/// Initializes the color with a CSS-like rgb string.
 		explicit color(std::string css_rgb);
@@ -313,10 +312,7 @@ namespace nana
 		/// @param lightness  in range of [0, 1]
 		color& from_hsl(double hue, double saturation, double lightness);	///< immutable alpha channel
 
-		color blend(const color& bgcolor, bool ignore_bgcolor_alpha) const;
-
-		/// Blends two colors with the specified alpha, and the alpha values that come with these two colors are both ignored. 
-		color blend(const color& bgcolor, double alpha) const;
+		color blend(const color& blending_color, double alpha) const;
 
 		/// Determines whether the color is completely transparent.
 		bool invisible() const;
diff --git a/include/nana/paint/graphics.hpp b/include/nana/paint/graphics.hpp
index c38bff7f..46605a47 100644
--- a/include/nana/paint/graphics.hpp
+++ b/include/nana/paint/graphics.hpp
@@ -118,7 +118,7 @@ namespace nana
 			void bitblt(const ::nana::rectangle& r_dst, const graphics& src, const point& p_src);///< Transfers the color data corresponding to r_dst from the src graphics at point p_src to this graphics.
 
 			void blend(const ::nana::rectangle& r, const ::nana::color&, double fade_rate);
-			void blend(const ::nana::rectangle& s_r, graphics& dst, const point& d_pos, double fade_rate) const;///< blends with the dst object.
+			void blend(const ::nana::rectangle& blend_r, const graphics& blend_graph, const point& blend_graph_point, double fade_rate);///< blends with the blend_graph.
 
 			void blur(const ::nana::rectangle& r, std::size_t radius);      ///< Blur process.
 
diff --git a/source/basic_types.cpp b/source/basic_types.cpp
index cc15f9ed..01bc5ef6 100644
--- a/source/basic_types.cpp
+++ b/source/basic_types.cpp
@@ -53,11 +53,6 @@ namespace nana
 			a_((static_cast<int>(rgba) & 0xFF) / 255.0)
 	{}
 
-	color::color(unsigned red, unsigned green, unsigned blue)
-		: r_(red), g_(green), b_(blue), a_(1.0)
-	{
-	}
-
 	color::color(unsigned red, unsigned green, unsigned blue, double alpha)
 		: r_(red), g_(green), b_(blue), a_(alpha)
 	{
@@ -426,47 +421,12 @@ namespace nana
 		return *this;
 	}
 
-	color color::blend(const color& bgcolor, bool ignore_bgcolor_alpha) const
-	{
-		if (a_ < 1.0)
-		{
-			color result;
-			if (0.0 < a_)
-			{
-				if (ignore_bgcolor_alpha || (1.0 == bgcolor.b_))
-				{
-					result.r_ = r_ * a_ + bgcolor.r_ * (1.0 - a_);
-					result.g_ = g_ * a_ + bgcolor.g_ * (1.0 - a_);
-					result.b_ = b_ * a_ + bgcolor.b_ * (1.0 - a_);
-					result.a_ = 1.0;
-				}
-				else
-				{
-					result.r_ = r_ * a_ + bgcolor.r_ * bgcolor.a_ * (1.0 - a_);
-					result.g_ = g_ * a_ + bgcolor.g_ * bgcolor.a_ * (1.0 - a_);
-					result.b_ = b_ * a_ + bgcolor.b_ * bgcolor.a_ * (1.0 - a_);
-					result.a_ = a_ + (bgcolor.a_ * (1.0 - a_));
-				}
-			}
-			else
-			{
-				result.r_ = bgcolor.r_;
-				result.g_ = bgcolor.g_;
-				result.b_ = bgcolor.b_;
-				result.a_ = (ignore_bgcolor_alpha ? 1.0 : bgcolor.a_);
-			}
-			return result;
-		}
-
-		return *this;
-	}
-
 	color color::blend(const color& bgcolor, double alpha) const
 	{
 		color result;
-		result.r_ = r_ * alpha + bgcolor.r_ * (1.0 - alpha);
-		result.g_ = g_ * alpha + bgcolor.g_ * (1.0 - alpha);
-		result.b_ = b_ * alpha + bgcolor.b_ * (1.0 - alpha);
+		result.r_ = r_ * (1.0 - alpha) + bgcolor.r_ * alpha;
+		result.g_ = g_ * (1.0 - alpha) + bgcolor.g_ * alpha;
+		result.b_ = b_ * (1.0 - alpha) + bgcolor.b_ * alpha;
 		result.a_ = 1.0;
 		return result;
 	}
diff --git a/source/gui/detail/bedrock_posix.cpp b/source/gui/detail/bedrock_posix.cpp
index 408022a0..f6a8740b 100644
--- a/source/gui/detail/bedrock_posix.cpp
+++ b/source/gui/detail/bedrock_posix.cpp
@@ -776,7 +776,7 @@ namespace detail
 						if(prev_captured_inside)
 						{
 							evt_code = event_code::mouse_leave;
-							msgwnd->set_action(mouse_action::normal);
+							msgwnd->set_action(mouse_action::normal_captured);
 						}
 						else
 						{
diff --git a/source/gui/detail/bedrock_windows.cpp b/source/gui/detail/bedrock_windows.cpp
index 4518863b..58f706b3 100644
--- a/source/gui/detail/bedrock_windows.cpp
+++ b/source/gui/detail/bedrock_windows.cpp
@@ -1063,7 +1063,7 @@ namespace detail
 						if(prev_captured_inside)
 						{
 							evt_code = event_code::mouse_leave;
-							msgwnd->set_action(mouse_action::normal);
+							msgwnd->set_action(mouse_action::normal_captured);
 						}
 						else
 						{
diff --git a/source/gui/detail/drawer.cpp b/source/gui/detail/drawer.cpp
index 2ef6e8c6..1a4f287d 100644
--- a/source/gui/detail/drawer.cpp
+++ b/source/gui/detail/drawer.cpp
@@ -382,7 +382,9 @@ namespace nana
 			if (effect.bground)
 			{
 				if (effect.bground_fade_rate >= 0.01)
-					data_impl_->window_handle->other.glass_buffer.blend(::nana::rectangle{ data_impl_->window_handle->other.glass_buffer.size() }, graphics, nana::point(), effect.bground_fade_rate);
+				{
+					graphics.blend(::nana::rectangle{ data_impl_->window_handle->other.glass_buffer.size() }, data_impl_->window_handle->other.glass_buffer, {}, 1 - effect.bground_fade_rate);
+				}
 			}
 			
 		}
diff --git a/source/gui/element.cpp b/source/gui/element.cpp
index 8d31a447..a67a7341 100644
--- a/source/gui/element.cpp
+++ b/source/gui/element.cpp
@@ -1,7 +1,7 @@
 /*
 *	Elements of GUI Gadgets
 *	Nana C++ Library(http://www.nanapro.org)
-*	Copyright(C) 2003-2015 Jinhao(cnjinhao@hotmail.com)
+*	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
 *
 *	Distributed under the Boost Software License, Version 1.0.
 *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -148,22 +148,22 @@ namespace nana
 				}
 				else
 				{
-					::nana::color highlighted(0x5e, 0xb6, 0xf7);
+					::nana::color highlighted(static_cast<color_rgb>(0x5eb6f7));
 					auto bld_bgcolor = bgcolor;
 					auto bld_fgcolor = fgcolor;
 					switch(es)
 					{
 					case element_state::hovered:
 					case element_state::focus_hovered:
-						bld_bgcolor = bgcolor.blend(highlighted, 0.8);
-						bld_fgcolor = fgcolor.blend(highlighted, 0.8);
+						bld_bgcolor = bgcolor.blend(highlighted, 0.2);
+						bld_fgcolor = fgcolor.blend(highlighted, 0.2);
 						break;
 					case element_state::pressed:
-						bld_bgcolor = bgcolor.blend(highlighted, 0.4);
-						bld_fgcolor = fgcolor.blend(highlighted, 0.4);
+						bld_bgcolor = bgcolor.blend(highlighted, 0.6);
+						bld_fgcolor = fgcolor.blend(highlighted, 0.6);
 						break;
 					case element_state::disabled:
-						bld_bgcolor = bld_fgcolor = nana::color(0xb2, 0xb7, 0xbc);
+						bld_bgcolor = bld_fgcolor = static_cast<color_rgb>(0xb2b7bc);
 						break;
 					default:
 						//Leave things as they are
@@ -493,10 +493,10 @@ namespace nana
 				{
 				case element_state::hovered:
 				case element_state::focus_hovered:
-					bgcolor = arg_bgcolor.blend(colors::white, 0.8);
+					bgcolor = arg_bgcolor.blend(colors::white, 0.2);
 					break;
 				case element_state::pressed:
-					bgcolor = arg_bgcolor.blend(colors::black, 0.8);
+					bgcolor = arg_bgcolor.blend(colors::black, 0.2);
 					break;
 				case element_state::disabled:
 					bgcolor = colors::dark_gray;
@@ -505,13 +505,13 @@ namespace nana
 				}
 
 				auto part_px = (r.height - 3) * 5 / 13;
-				graph.rectangle(r, false, bgcolor.blend(colors::black, 0.6));
+				graph.rectangle(r, false, bgcolor.blend(colors::black, 0.4));
 				
 				::nana::point left_top{ r.x + 1, r.y + 1 }, right_top{r.right() - 2, r.y + 1};
 				::nana::point left_mid{ r.x + 1, r.y + 1 + static_cast<int>(part_px) }, right_mid{ right_top.x, left_mid.y };
 				::nana::point left_bottom{ r.x + 1, r.bottom() - 2 }, right_bottom{ r.right() - 2, r.bottom() - 2 };
 
-				graph.palette(false, bgcolor.blend(colors::white, 0.9));
+				graph.palette(false, bgcolor.blend(colors::white, 0.1));
 				graph.line(left_top, left_mid);
 				graph.line(right_top, right_mid);
 
@@ -520,12 +520,12 @@ namespace nana
 
 				left_mid.y++;
 				right_mid.y++;
-				graph.palette(false, bgcolor.blend(colors::black, 0.8));
+				graph.palette(false, bgcolor.blend(colors::black, 0.2));
 				graph.line(left_mid, left_bottom);
 				graph.line(right_mid, right_bottom);
 
 				::nana::rectangle part_r{ r.x + 2, r.y + 2, r.width - 4, part_px };
-				graph.rectangle(part_r, true, bgcolor.blend(colors::white, 0.8));
+				graph.rectangle(part_r, true, bgcolor.blend(colors::white, 0.2));
 
 				part_r.y += static_cast<int>(part_r.height);
 				part_r.height = (r.height - 3 - part_r.height);
@@ -545,7 +545,7 @@ namespace nana
 				{
 				case element_state::hovered:
 				case element_state::pressed:
-					clr = clr.blend(colors::black, 0.8);
+					clr = clr.blend(colors::black, 0.2);
 					break;
 				case element_state::disabled:
 					clr = colors::dark_gray;
@@ -954,7 +954,7 @@ namespace nana
 				ps[11].x = r.x + gap;
 				ps[11].y = r.y + gap;
 
-				graph.palette(false, fgcolor.blend(colors::black, true));
+				graph.palette(false, fgcolor.blend(colors::black, 1.0 - fgcolor.a()));
 
 				for (int i = 0; i < 11; ++i)
 					graph.line(ps[i], ps[i + 1]);
diff --git a/source/gui/place_parts.hpp b/source/gui/place_parts.hpp
index d7dd0607..0c2414b7 100644
--- a/source/gui/place_parts.hpp
+++ b/source/gui/place_parts.hpp
@@ -149,7 +149,7 @@ namespace nana
 					color xclr = colors::red;
 
 					if(x_state_ == ::nana::mouse_action::pressed)
-						xclr = xclr.blend(colors::white, 0.8);
+						xclr = xclr.blend(colors::white, 0.2);
 
 					graph.rectangle(r, true, xclr);
 				}
diff --git a/source/gui/programming_interface.cpp b/source/gui/programming_interface.cpp
index 49f3adf8..c4ca6192 100644
--- a/source/gui/programming_interface.cpp
+++ b/source/gui/programming_interface.cpp
@@ -1380,6 +1380,7 @@ namespace API
 			switch(iwd->flags.action)
 			{
 			case nana::mouse_action::normal:
+			case nana::mouse_action::normal_captured:
 				return (is_focused ? nana::element_state::focus_normal : nana::element_state::normal);
 			case nana::mouse_action::hovered:
 				return (is_focused ? nana::element_state::focus_hovered : nana::element_state::hovered);
diff --git a/source/gui/widgets/button.cpp b/source/gui/widgets/button.cpp
index a81a5393..01de4f7c 100644
--- a/source/gui/widgets/button.cpp
+++ b/source/gui/widgets/button.cpp
@@ -311,8 +311,8 @@ namespace nana{	namespace drawerbase
 			nana::rectangle r(graph.size());
 			r.pare_off(1);
 
-			auto from = attr_.bgcolor.blend(colors::white, 0.2);
-			auto to = attr_.bgcolor.blend(colors::black, 0.95);
+			auto from = attr_.bgcolor.blend(colors::white, 0.8);
+			auto to = attr_.bgcolor.blend(colors::black, 0.05);
 
 			if (element_state::pressed == attr_.e_state)
 			{
diff --git a/source/gui/widgets/categorize.cpp b/source/gui/widgets/categorize.cpp
index 0ce7646c..b00bdf8c 100644
--- a/source/gui/widgets/categorize.cpp
+++ b/source/gui/widgets/categorize.cpp
@@ -78,7 +78,7 @@ namespace nana
 
 					if(ue.what == ue.none || (API::window_enabled(wd) == false))
 					{	//the mouse is out of the widget.
-						style_.bgcolor = style_.bgcolor.blend(static_cast<color_rgb>(0xa0c9f5), 0.9);
+						style_.bgcolor = style_.bgcolor.blend(static_cast<color_rgb>(0xa0c9f5), 0.1);
 					}
 					graph.rectangle(r, true, style_.bgcolor);
 				}
diff --git a/source/gui/widgets/combox.cpp b/source/gui/widgets/combox.cpp
index c19b310d..e0432278 100644
--- a/source/gui/widgets/combox.cpp
+++ b/source/gui/widgets/combox.cpp
@@ -238,7 +238,9 @@ namespace nana
 								{
 									paint::graphics trns_graph{ graph.size() };
 									if (API::dev::copy_transparent_background(this->widget_ptr()->handle(), trns_graph))
-										trns_graph.blend(rectangle{ trns_graph.size() }, graph, { 0, 0 }, 0.5);
+									{
+										graph.blend(rectangle{ trns_graph.size() }, trns_graph, {}, 0.5);
+									}
 								}
 							};
 						}
diff --git a/source/gui/widgets/date_chooser.cpp b/source/gui/widgets/date_chooser.cpp
index aa824637..b2f743e4 100644
--- a/source/gui/widgets/date_chooser.cpp
+++ b/source/gui/widgets/date_chooser.cpp
@@ -1,7 +1,7 @@
 /*
  *	A date chooser Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2016 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -93,7 +93,8 @@ namespace nana
 						r.y = static_cast<int>(newbuf.height() - r.height) / 2;
 						newbuf.stretch(nzbuf, r);
 
-						nzbuf.blend(::nana::rectangle{ nzbuf.size() }, dzbuf, nana::point(), fade * (count - i));
+						dzbuf.blend(::nana::rectangle{ nzbuf.size() }, nzbuf, {}, 1 - fade * (count - i));
+
 						graph.bitblt(refpos.x, refpos.y, dzbuf);
 
 						API::update_window(window_handle);
@@ -121,7 +122,8 @@ namespace nana
 						nzbuf.rectangle(true, colors::white);
 						newbuf.stretch(nzbuf, r);
 
-						nzbuf.blend(::nana::rectangle{ nzbuf.size() }, dzbuf, nana::point(), fade * (count - i));
+						dzbuf.blend(::nana::rectangle{ nzbuf.size() }, nzbuf, {}, 1.0 - fade * (count - i));
+
 						graph.bitblt(refpos.x, refpos.y, dzbuf);
 
 						API::update_window(window_handle);
diff --git a/source/gui/widgets/group.cpp b/source/gui/widgets/group.cpp
index 3ba3179b..ab8e9e73 100644
--- a/source/gui/widgets/group.cpp
+++ b/source/gui/widgets/group.cpp
@@ -1,7 +1,7 @@
 /**
  *	A group widget implementation
  *	Nana C++ Library(http://www.nanaro.org)
- *	Copyright(C) 2015-2016 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2015-2017 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0. 
  *	(See accompanying file LICENSE_1_0.txt or copy at 
@@ -210,9 +210,9 @@ namespace nana{
 
 		color pbg = API::bgcolor(this->parent());
 
-		impl_->caption.bgcolor(pbg.blend(colors::black, 0.975));
+		impl_->caption.bgcolor(pbg.blend(colors::black, 0.025));
 
-		this->bgcolor(pbg.blend(colors::black, 0.950));
+		this->bgcolor(pbg.blend(colors::black, 0.05));
 
 		drawing dw(*this);
 
diff --git a/source/gui/widgets/label.cpp b/source/gui/widgets/label.cpp
index 35222859..6abe41f0 100644
--- a/source/gui/widgets/label.cpp
+++ b/source/gui/widgets/label.cpp
@@ -149,7 +149,7 @@ namespace nana
 					graph.typeface(pre_font);
 				}
 
-				bool find(int x, int y, std::wstring& target, std::wstring& url) const
+				bool find(int x, int y, std::wstring& target, std::wstring& url) const noexcept
 				{
 					for (auto & t : traceable_)
 					{
@@ -225,7 +225,7 @@ namespace nana
 					def_.fgcolor = fgcolor;
 				}
 
-				const ::nana::color& _m_fgcolor(nana::widgets::skeletons::fblock* fp)
+				const ::nana::color& _m_fgcolor(nana::widgets::skeletons::fblock* fp) noexcept
 				{
 					while(fp->fgcolor.invisible())
 					{
@@ -236,7 +236,7 @@ namespace nana
 					return fp->fgcolor;
 				}
 
-				std::size_t _m_font_size(nana::widgets::skeletons::fblock* fp)
+				std::size_t _m_font_size(nana::widgets::skeletons::fblock* fp) noexcept
 				{
 					while(fp->font_size == 0xFFFFFFFF)
 					{
@@ -247,7 +247,7 @@ namespace nana
 					return fp->font_size;
 				}
 
-				bool _m_bold(nana::widgets::skeletons::fblock* fp)
+				bool _m_bold(nana::widgets::skeletons::fblock* fp) noexcept
 				{
 					while(fp->bold_empty)
 					{
@@ -258,7 +258,7 @@ namespace nana
 					return fp->bold;
 				}
 
-				const std::string& _m_fontname(nana::widgets::skeletons::fblock* fp)
+				const std::string& _m_fontname(nana::widgets::skeletons::fblock* fp) noexcept
 				{
 					while(fp->font.empty())
 					{
@@ -305,7 +305,7 @@ namespace nana
 					}
 				}
 
-				void _m_align_x_base(const render_status& rs, pixel_tag & px, unsigned w)
+				void _m_align_x_base(const render_status& rs, pixel_tag & px, unsigned w) noexcept
 				{
 					switch(rs.text_align)
 					{
@@ -498,7 +498,7 @@ namespace nana
 					return (rs.pos.y <= lastpos);
 				}
 
-				static bool _m_overline(const render_status& rs, int right, bool equal_required)
+				static bool _m_overline(const render_status& rs, int right, bool equal_required) noexcept
 				{
 					if(align::left == rs.text_align)
 						return (equal_required ? right >= static_cast<int>(rs.allowed_width) : right > static_cast<int>(rs.allowed_width));
@@ -569,9 +569,12 @@ namespace nana
 							else
 							{
 								auto str = data_ptr->text().substr(text_range.first, text_range.second);
-								graph.string({ rs.pos.x, y }, str, _m_fgcolor(fblock_ptr));
 								sz = graph.text_extent_size(str);
+
+								graph.string({ rs.pos.x, y }, str, _m_fgcolor(fblock_ptr));
 							}
+
+
 							_m_inser_if_traceable(rs.pos.x, y, sz, fblock_ptr);
 							rs.pos.x += static_cast<int>(sz.width);
 
@@ -586,7 +589,7 @@ namespace nana
 					}
 				}
 
-				std::pair<std::size_t, std::size_t> _m_locate(dstream::linecontainer::iterator& i, std::size_t pos)
+				static std::pair<std::size_t, std::size_t> _m_locate(dstream::linecontainer::iterator& i, std::size_t pos)
 				{
 					std::size_t n = i->data_ptr->text().length();
 					while(pos >= n)
diff --git a/source/gui/widgets/listbox.cpp b/source/gui/widgets/listbox.cpp
index 20010e2a..51eb0b56 100644
--- a/source/gui/widgets/listbox.cpp
+++ b/source/gui/widgets/listbox.cpp
@@ -46,7 +46,6 @@ namespace nana
 	{
 		namespace listbox
 		{
-
 			class model_lock_guard
 			{
 				model_lock_guard(const model_lock_guard&) = delete;
@@ -3128,7 +3127,7 @@ namespace nana
 
 				void draw(graph_reference graph, const nana::rectangle& r)
 				{
-					const auto border_color = essence_->scheme_ptr->header_bgcolor.get_color().blend(colors::black, 0.8);
+					const auto border_color = essence_->scheme_ptr->header_bgcolor.get_color().blend(colors::black, 0.2);
 
 					int text_top = (r.height - essence_->text_height) / 2 + r.y;
 					auto text_color = essence_->scheme_ptr->header_fgcolor.get_color();
@@ -3169,7 +3168,7 @@ namespace nana
 					{
 						column_r.width = (r.right() - column_r.x);
 						if(API::dev::copy_transparent_background(essence_->listbox_ptr->handle(), column_r, graph, column_r.position()))
-							graph.blend(column_r, essence_->scheme_ptr->header_bgcolor, 0.8);
+							graph.blend(column_r, essence_->scheme_ptr->header_bgcolor, 0.5);
 						else
 							graph.rectangle(column_r, true, essence_->scheme_ptr->header_bgcolor);
 					}
@@ -3237,10 +3236,10 @@ namespace nana
 						paint::graphics grad_graph{column_r.dimension()};
 						grad_graph.gradual_rectangle(rectangle{column_r.dimension()}, bgcolor.blend(colors::white, 0.1), bgcolor.blend(colors::black, 0.1), true);
 
-						grad_graph.blend(rectangle{column_r.dimension()}, graph, column_r.position(), 0.3);
+						graph.blend(column_r, grad_graph, {}, 0.8);
 					}
 					else
-						graph.gradual_rectangle(column_r, bgcolor.blend(colors::white, 0.9), bgcolor.blend(colors::black, 0.9), true);
+						graph.gradual_rectangle(column_r, bgcolor.blend(colors::white, 0.1), bgcolor.blend(colors::black, 0.1), true);
 
 					paint::aligner text_aligner{ graph, column.alignment, column.alignment };
 
@@ -3283,7 +3282,7 @@ namespace nana
 
 					auto xpos = essence_->header.position(col.index, nullptr) + pos.x - grabs_.start_pos;
 
-					fl_graph.blend(rectangle{ fl_graph.size() }, *(essence_->graph), point{ xpos - essence_->content_view->origin().x + rect.x, rect.y }, 0.5);
+					essence_->graph->blend(rectangle{ point{ xpos - essence_->content_view->origin().x + rect.x, rect.y } , fl_graph.size() }, fl_graph, {}, 0.5);
 				}
 
 			private:
@@ -3479,10 +3478,10 @@ namespace nana
 						};
 
 						paint::graphics box_graph{ box_size };
-						box_graph.rectangle(true, essence_->scheme_ptr->selection_box.get_color().blend(colors::white, 0.4));
+						box_graph.rectangle(true, essence_->scheme_ptr->selection_box.get_color().blend(colors::white, 0.6));
 						box_graph.rectangle(false, essence_->scheme_ptr->selection_box.get_color());
 
-						box_graph.blend(rectangle{ box_size }, *essence_->graph, essence_->coordinate_cast(box_position, false), 0.5);
+						essence_->graph->blend(rectangle{ essence_->coordinate_cast(box_position, false), box_size }, box_graph, {}, 0.5);
 					}
 				}
 			private:
@@ -3552,9 +3551,9 @@ namespace nana
 					if (item_state::highlighted == state)
 					{
 						if (item.flags.selected)
-							bgcolor = bgcolor.blend(colors::black, 0.9);
+							bgcolor = bgcolor.blend(colors::black, 0.1);
 						else
-							bgcolor = bgcolor.blend(essence_->scheme_ptr->item_highlighted, 0.3);
+							bgcolor = bgcolor.blend(essence_->scheme_ptr->item_highlighted, 0.7);
 					}
 
 					if (is_transparent)
diff --git a/source/gui/widgets/menubar.cpp b/source/gui/widgets/menubar.cpp
index e21b50fb..9b17d1e7 100644
--- a/source/gui/widgets/menubar.cpp
+++ b/source/gui/widgets/menubar.cpp
@@ -1,7 +1,7 @@
 /*
 *	A Menubar implementation
 *	Nana C++ Library(http://www.nanapro.org)
-*	Copyright(C) 2009-2015 Jinhao(cnjinhao@hotmail.com)
+*	Copyright(C) 2009-2017 Jinhao(cnjinhao@hotmail.com)
 *
 *	Distributed under the Boost Software License, Version 1.0.
 *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -204,7 +204,7 @@ namespace nana
 						{
 							int x = item_pos.x + item_s.width;
 							int y1 = item_pos.y + 2, y2 = item_pos.y + item_s.height - 1;
-							graph.line({ x, y1 }, { x, y2 }, bgcolor.blend(colors::gray_border, 0.4));
+							graph.line({ x, y1 }, { x, y2 }, bgcolor.blend(colors::gray_border, 0.6));
 							graph.line({ x + 1, y1 }, { x + 1, y2 }, bgcolor.blend(colors::button_face_shadow_end, 0.5));
 						}
 
diff --git a/source/gui/widgets/slider.cpp b/source/gui/widgets/slider.cpp
index 9c656d31..b6fdfc09 100644
--- a/source/gui/widgets/slider.cpp
+++ b/source/gui/widgets/slider.cpp
@@ -80,7 +80,7 @@ namespace nana
 					}
 
 					color rgb = schm.color_slider;
-					if (mouse_action::normal != mouse_act)
+					if (mouse_action::normal != mouse_act && mouse_action::normal_captured != mouse_act)
 						rgb = schm.color_slider_highlighted;
 
 					graph.frame_rectangle(area, rgb + static_cast<color_rgb>(0x0d0d0d), 1);
@@ -128,7 +128,7 @@ namespace nana
 						arrow_pos = data.position - arrow_weight;
 					}
 
-					graph_vern.blend(rectangle{ label_size }, graph, label_pos, 0.5);
+					graph.blend(rectangle{ label_pos, label_size }, graph_vern, {}, 0.5);
 
 
 					unsigned arrow_color = 0x7F | schm.color_vernier.get_color().argb().value;
@@ -210,8 +210,7 @@ namespace nana
 						arrow_pos = data.position;
 					}
 
-					graph_vern.blend(rectangle{ label_size }, graph, label_pos, 0.5);
-
+					graph.blend(rectangle{ label_pos, label_size }, graph_vern, {}, 0.5);
 
 					unsigned arrow_color = 0x7F | schm.color_vernier.get_color().argb().value;
 					for (auto & color : arrow_pxbuf)
@@ -483,7 +482,7 @@ namespace nana
 					attr_.adorn_pos = xpos;
 					attr_.is_draw_adorn = true;
 
-					if (::nana::mouse_action::normal == slider_state_.mouse_state)
+					if (mouse_action::normal == slider_state_.mouse_state || mouse_action::normal_captured == slider_state_.mouse_state)
 						slider_state_.mouse_state = ::nana::mouse_action::hovered;
 
 					return (adorn_pos != static_cast<int>(xpos));
@@ -610,7 +609,7 @@ namespace nana
 					if (attr_.slider.vert)
 						attr_.slider.pos = range - attr_.slider.pos;
 
-					if(::nana::mouse_action::normal == slider_state_.mouse_state)
+					if(mouse_action::normal == slider_state_.mouse_state || mouse_action::normal_captured == slider_state_.mouse_state)
 						attr_.adorn_pos = attr_.slider.pos;
 				}
 
diff --git a/source/gui/widgets/tabbar.cpp b/source/gui/widgets/tabbar.cpp
index b8824f3b..ad614c09 100644
--- a/source/gui/widgets/tabbar.cpp
+++ b/source/gui/widgets/tabbar.cpp
@@ -1,6 +1,6 @@
 /*
  *	A Tabbar Implementation
- *	Copyright(C) 2003-2015 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -49,9 +49,9 @@ namespace nana
 					{
 						bgcolor_ = bgcolor;
 
-						dark_bgcolor_ = bgcolor.blend(colors::black, 0.9);
+						dark_bgcolor_ = bgcolor.blend(colors::black, 0.1);
 						blcolor_ = bgcolor.blend(colors::black, 0.5);
-						ilcolor_ = bgcolor.blend(colors::white, 0.9);
+						ilcolor_ = bgcolor.blend(colors::white, 0.1);
 					}
 
 					graph.rectangle(true, bgcolor);
@@ -74,7 +74,7 @@ namespace nana
 					{
 						bgcolor = m.bgcolor;
 						blcolor = m.bgcolor.blend(colors::black, 0.5);
-						dark_bgcolor = m.bgcolor.blend(colors::black, 0.9);
+						dark_bgcolor = m.bgcolor.blend(colors::black, 0.1);
 					}
 
 					auto round_r = r;
@@ -141,9 +141,9 @@ namespace nana
 						::nana::color rect_clr{ static_cast<color_rgb>(0x9da3ab) };
 						graph.round_rectangle(r, 1, 1, rect_clr, false, {});
 						nana::rectangle draw_r(r);
-						graph.rectangle(draw_r.pare_off(1), false, rect_clr.blend(bgcolor, 0.8));
-						graph.rectangle(draw_r.pare_off(1), false, rect_clr.blend(bgcolor, 0.4));
 						graph.rectangle(draw_r.pare_off(1), false, rect_clr.blend(bgcolor, 0.2));
+						graph.rectangle(draw_r.pare_off(1), false, rect_clr.blend(bgcolor, 0.6));
+						graph.rectangle(draw_r.pare_off(1), false, rect_clr.blend(bgcolor, 0.8));
 					}
 					else if (!active)
 						clr = static_cast<color_rgb>(0x9299a4);
diff --git a/source/gui/widgets/toolbar.cpp b/source/gui/widgets/toolbar.cpp
index 94b5f888..953e4796 100644
--- a/source/gui/widgets/toolbar.cpp
+++ b/source/gui/widgets/toolbar.cpp
@@ -1,7 +1,7 @@
 /*
  *	A Toolbar Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2016 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -166,8 +166,10 @@ namespace nana
 							gh.rgb_to_wb();
 							gh.paste(graph, pos.x, pos.y);
 						}
-						else if(state == state_t::normal)
+						else if (state == state_t::normal)
+						{
 							graph.blend(nana::rectangle(pos, imgsize), ::nana::color(0xc0, 0xdd, 0xfc).blend(bgcolor, 0.5), 0.25);
+						}
 
 						x += scale;
 						width -= scale;
@@ -230,7 +232,7 @@ namespace nana
 
 					auto bgcolor = API::bgcolor(widget_->handle());
 					graph.palette(true, bgcolor);
-					graph.gradual_rectangle(rectangle{ graph.size() }, bgcolor.blend(colors::white, 0.9), bgcolor.blend(colors::black, 0.95), true);
+					graph.gradual_rectangle(rectangle{ graph.size() }, bgcolor.blend(colors::white, 0.1), bgcolor.blend(colors::black, 0.05), true);
 
 					item_renderer ir(graph, impl_->textout, impl_->scale, bgcolor);
 					size_type index = 0;
diff --git a/source/gui/widgets/treebox.cpp b/source/gui/widgets/treebox.cpp
index 023471ae..54c94f94 100644
--- a/source/gui/widgets/treebox.cpp
+++ b/source/gui/widgets/treebox.cpp
@@ -1240,7 +1240,8 @@ namespace nana
 								item_graph.rectangle(false, clrptr[1]);
 								item_graph.rectangle(rectangle{attr.area.dimension()}.pare_off(1), true, *clrptr);
 
-								item_graph.blend(rectangle{ attr.area.dimension() }, graph, attr.area.position(), 0.5);
+
+								graph.blend(attr.area, item_graph, attr.area.position(), 0.5);
 							}
 							else
 							{
diff --git a/source/gui/wvl.cpp b/source/gui/wvl.cpp
index 27e7e5ea..ff9509d8 100644
--- a/source/gui/wvl.cpp
+++ b/source/gui/wvl.cpp
@@ -1,6 +1,6 @@
 /*
  *	Nana GUI Library Definition
- *	Copyright(C) 2003-2015 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0. 
  *	(See accompanying file LICENSE_1_0.txt or copy at 
@@ -41,7 +41,11 @@ namespace nana
 	{
 		if (!wait) return;
 		std::cout << "waiting " << wait << " sec...\n";
+#ifdef STD_THREAD_NOT_SUPPORTED
+		boost::this_thread::sleep_for(boost::chrono::seconds{ wait });
+#else
 		std::this_thread::sleep_for(std::chrono::seconds{ wait });
+#endif
 	}
 
 	void pump()
diff --git a/source/paint/detail/native_paint_interface.cpp b/source/paint/detail/native_paint_interface.cpp
index 6a2b66ee..b68faea7 100644
--- a/source/paint/detail/native_paint_interface.cpp
+++ b/source/paint/detail/native_paint_interface.cpp
@@ -100,16 +100,16 @@ namespace detail
 
 	void blend(drawable_type dw, const rectangle& area, pixel_color_t color, double fade_rate)
 	{
-		if (fade_rate < 0)
-			fade_rate = 0;
-		else if (fade_rate >= 1)
+		if (fade_rate <= 0)
 			return;
+		else if (fade_rate >= 1)
+			fade_rate = 1;
 
 		rectangle r;
 		if (false == ::nana::overlap(rectangle{ drawable_size(dw) }, area, r))
 			return;
 
-		auto const color_fd_rate = (double(color.element.alpha_channel) / 255.0) * (1 - fade_rate);
+		auto const color_fd_rate = (double(color.element.alpha_channel) / 255.0) * fade_rate;
 
 		fade_rate = (1 - color_fd_rate);
 
diff --git a/source/paint/graphics.cpp b/source/paint/graphics.cpp
index b47907f1..e4b349fc 100644
--- a/source/paint/graphics.cpp
+++ b/source/paint/graphics.cpp
@@ -659,19 +659,6 @@ namespace paint
 			}
 		}
 
-		void graphics::blend(const nana::rectangle& s_r, graphics& dst, const nana::point& d_pos, double fade_rate) const
-		{
-			if(dst.impl_->handle && impl_->handle && (dst.impl_->handle != impl_->handle))
-			{
-				pixel_buffer s_pixbuf;
-				s_pixbuf.attach(impl_->handle, ::nana::rectangle{ size() });
-
-				s_pixbuf.blend(s_r, dst.impl_->handle, d_pos, fade_rate);
-
-				if(dst.impl_->changed == false) dst.impl_->changed = true;
-			}
-		}
-
 		void graphics::blend(const nana::rectangle& r, const ::nana::color& clr, double fade_rate)
 		{
 			if (impl_->handle)
@@ -681,6 +668,21 @@ namespace paint
 			}
 		}
 
+		void graphics::blend(const ::nana::rectangle& blend_r, const graphics& graph, const point& blend_graph_point, double fade_rate)///< blends with the blend_graph.
+		{
+			if (graph.impl_->handle && impl_->handle && (graph.impl_->handle != impl_->handle))
+			{
+				pixel_buffer graph_px;
+
+				nana::rectangle r{ blend_graph_point, blend_r.dimension() };
+
+				graph_px.attach(graph.impl_->handle, r);
+				graph_px.blend(r, impl_->handle, blend_r.position(), 1 - fade_rate);
+
+				if (graph.impl_->changed == false) graph.impl_->changed = true;
+			}
+		}
+
 		void graphics::blur(const nana::rectangle& r, std::size_t radius)
 		{
 			if(impl_->handle)