diff --git a/include/nana/gui/widgets/tabbar.hpp b/include/nana/gui/widgets/tabbar.hpp
index 17a57411..0266ba20 100644
--- a/include/nana/gui/widgets/tabbar.hpp
+++ b/include/nana/gui/widgets/tabbar.hpp
@@ -35,6 +35,19 @@ namespace nana
 		{}
 	};
 
+	template<typename T>
+	struct arg_tabbar_adding
+		: public event_arg
+	{
+		arg_tabbar_adding(tabbar<T>& wdg, std::size_t pos)
+			: widget(wdg), where(pos)
+		{}
+
+		tabbar<T> & widget;
+		mutable bool add = true;					///< determines whether to add the item
+		std::size_t where;							///< position where to add the item
+	};
+
 	template<typename T>
 	struct arg_tabbar_removed : public arg_tabbar<T>
 	{
@@ -56,6 +69,7 @@ namespace nana
 			{
 				using value_type = T;
 
+				basic_event<arg_tabbar_adding<value_type>> adding;
 				basic_event<arg_tabbar<value_type>> added;
 				basic_event<arg_tabbar<value_type>> activated;
 				basic_event<arg_tabbar_removed<value_type>> removed;
@@ -65,6 +79,7 @@ namespace nana
 			{
 			public:
 				virtual ~event_agent_interface() = default;
+				virtual bool adding(std::size_t) = 0;
 				virtual void added(std::size_t) = 0;
 				virtual void activated(std::size_t) = 0;
 				virtual bool removed(std::size_t, bool & close_attached) = 0;
@@ -107,6 +122,13 @@ namespace nana
 					: tabbar_(tb), drawer_trigger_(dtr)
 				{}
 
+				bool adding(std::size_t pos) override
+				{
+					::nana::arg_tabbar_adding<T> arg(tabbar_, pos);
+					tabbar_.events().adding.emit(arg, tabbar_);
+					return arg.add;
+				}
+
 				void added(std::size_t pos) override
 				{
 					if(pos != npos)
diff --git a/source/gui/filebox.cpp b/source/gui/filebox.cpp
index fcaba515..7feda8bd 100644
--- a/source/gui/filebox.cpp
+++ b/source/gui/filebox.cpp
@@ -1257,7 +1257,7 @@ namespace nana
 			IShellItem *init_path{ nullptr };
 			hr = SHCreateItemFromParsingName(impl_->init_path.wstring().c_str(), nullptr, IID_PPV_ARGS(&init_path));
 			if (SUCCEEDED(hr))
-				fd->SetDefaultFolder(init_path);
+				fd->SetFolder(init_path);
 
 			fd->SetOptions(FOS_PICKFOLDERS);
 			fd->Show(reinterpret_cast<HWND>(API::root(impl_->owner))); // the native handle of the parent nana form goes here
diff --git a/source/gui/widgets/tabbar.cpp b/source/gui/widgets/tabbar.cpp
index 8970089b..d5a05907 100644
--- a/source/gui/widgets/tabbar.cpp
+++ b/source/gui/widgets/tabbar.cpp
@@ -751,15 +751,27 @@ namespace nana
 					if((pos == npos) || (pos >= list_.size()))
 					{
 						pos = list_.size();
+						
+						if(evt_agent_)
+							if(!evt_agent_->adding(pos))
+								return false;
+
 						this->list_.emplace_back();
 					}
 					else
+					{
+						if(evt_agent_)
+							if(!evt_agent_->adding(pos))
+								return false;
+
 						list_.emplace(iterator_at(pos));
+					}
 
 					basis_.active = pos;
 					if(evt_agent_)
 					{
 						evt_agent_->added(pos);
+						erase(pos);
 						evt_agent_->activated(pos);
 					}
 					return true;