fix wrong order of widget deletion

include/nana/gui/widgets/widget.hpp

@@ -147,8 +147,6 @@ namespace nana
 			: public widget
 		{
 		public:
-			~widget_base();
-
 			window handle() const override;
 		protected:
 			void _m_notify_destroy() override;
@@ -172,6 +170,11 @@ namespace nana
 				scheme_{ API::dev::make_scheme<Scheme>() }
 		{}
 
+		~widget_object()
+		{
+			API::close_window(handle());
+		}
+
 		event_type& events() const
 		{
 			return *events_;
@@ -255,6 +258,11 @@ namespace nana
 			: events_{ std::make_shared<Events>() }, scheme_{ API::dev::make_scheme<scheme_type>() }
 		{}
 
+		~widget_object()
+		{
+			API::close_window(handle());
+		}
+
 		event_type& events() const
 		{
 			return *events_;
@@ -329,6 +337,11 @@ namespace nana
 			_m_bind_and_attach();
 		}
 
+		~widget_object()
+		{
+			API::close_window(handle());
+		}
+
 		event_type& events() const
 		{
 			return *events_;
@@ -461,6 +474,11 @@ namespace nana
 			: events_{ std::make_shared<Events>() }, scheme_{ API::dev::make_scheme<scheme_type>() }
 		{}
 
+		~widget_object()
+		{
+			API::close_window(handle());
+		}
+
 		event_type& events() const
 		{
 			return *events_;

source/gui/widgets/widget.cpp

@@ -382,12 +382,6 @@ namespace nana
 		}
 
 		//class widget_base
-			widget_base::~widget_base()
-			{
-				if (handle_)
-					API::close_window(handle_);
-			}
-
 			window widget_base::handle() const
 			{
 				return handle_;