diff --git a/include/nana/gui/widgets/combox.hpp b/include/nana/gui/widgets/combox.hpp
index 03f319d9..fb58c5b6 100644
--- a/include/nana/gui/widgets/combox.hpp
+++ b/include/nana/gui/widgets/combox.hpp
@@ -230,5 +230,15 @@ namespace nana
 		void _m_caption(nana::string&&) override;
 		nana::any * _m_anyobj(std::size_t pos, bool alloc_if_empty) const override;
 	};
+
+	namespace dev
+	{
+		template<>
+		struct widget_traits<combox>
+		{
+			using event_type = drawerbase::combox::combox_events;
+			using scheme_type = ::nana::widgets::skeletons::text_editor_scheme;
+		};
+	}
 }
 #endif
diff --git a/include/nana/gui/widgets/listbox.hpp b/include/nana/gui/widgets/listbox.hpp
index b9680983..adb435ec 100644
--- a/include/nana/gui/widgets/listbox.hpp
+++ b/include/nana/gui/widgets/listbox.hpp
@@ -556,5 +556,15 @@ By \a clicking on a header the list get \a reordered, first up, and then down al
 		drawerbase::listbox::category_t* _m_at_key(std::shared_ptr<nana::detail::key_interface>);
 		void _m_ease_key(nana::detail::key_interface*);
 	};
+
+	namespace dev
+	{
+		template<>
+		struct widget_traits<listbox>
+		{
+			using event_type = drawerbase::listbox::listbox_events;
+			using scheme_type = drawerbase::listbox::scheme;
+		};
+	}
 }//end namespace nana
 #endif
diff --git a/include/nana/gui/widgets/textbox.hpp b/include/nana/gui/widgets/textbox.hpp
index 9f5f7552..bf8a972d 100644
--- a/include/nana/gui/widgets/textbox.hpp
+++ b/include/nana/gui/widgets/textbox.hpp
@@ -193,5 +193,16 @@ namespace nana
 		void _m_caption(::nana::string&&) override;
 		void _m_typeface(const paint::font&) override;
 	};
+
+	namespace dev
+	{
+		/// Traits for widget classes
+		template<>
+		struct widget_traits<textbox>
+		{
+			using event_type = drawerbase::textbox::textbox_events;
+			using scheme_type = ::nana::widgets::skeletons::text_editor_scheme;
+		};
+	}
 }//end namespace nana
 #endif
diff --git a/source/gui/programming_interface.cpp b/source/gui/programming_interface.cpp
index 8979c61f..7330d4d9 100644
--- a/source/gui/programming_interface.cpp
+++ b/source/gui/programming_interface.cpp
@@ -158,7 +158,6 @@ namespace API
 				iwd->expr_colors = wdg_colors;
 		}
 
-
 		widget_colors* get_scheme(window wd)
 		{
 			auto iwd = reinterpret_cast<restrict::core_window_t*>(wd);