diff --git a/include/nana/gui/detail/basic_window.hpp b/include/nana/gui/detail/basic_window.hpp
index 517f9c3f..ce06da4e 100644
--- a/include/nana/gui/detail/basic_window.hpp
+++ b/include/nana/gui/detail/basic_window.hpp
@@ -242,9 +242,10 @@ namespace detail
 					tabstop(*p_tabstop),
 					effects_edge_nimbus(*p_effects),
 					draw_through(*p_draw_through)
-				{
-					
+				{}
 				}
+
+				~attr_root_tag();
 			};
 
 			const category::flags category;
diff --git a/source/gui/detail/basic_window.cpp b/source/gui/detail/basic_window.cpp
index 0a5542fe..ef550a1f 100644
--- a/source/gui/detail/basic_window.cpp
+++ b/source/gui/detail/basic_window.cpp
@@ -209,6 +209,10 @@ namespace nana
 		//end class caret
 
 		//struct basic_window
+			basic_window::other_tag::attr_root_tag::~attr_root_tag()
+			{
+				std::cout<<"~attr_root_tag "<<this<<std::endl;
+			}
 			//struct basic_window::other_tag
 				basic_window::other_tag::other_tag(category::flags categ)
 					: category(categ), active_window(nullptr), upd_state(update_state::none)