diff --git a/source/gui/widgets/treebox.cpp b/source/gui/widgets/treebox.cpp
index 1c14b6c2..aad33dd3 100644
--- a/source/gui/widgets/treebox.cpp
+++ b/source/gui/widgets/treebox.cpp
@@ -74,93 +74,7 @@ namespace nana
 				return nullptr;
 			}
 
-			class tlwnd_drawer
-				: public drawer_trigger, public compset_interface
-			{
-			public:
-				typedef drawer_trigger::graph_reference graph_reference;
-
-				void assign(const item_attribute_t & item_attr, const pat::cloneable<renderer_interface>* renderer, const pat::cloneable<compset_placer_interface> * compset_placer)
-				{
-					if(renderer && compset_placer)
-					{
-						renderer_ = *renderer;
-						placer_ = *compset_placer;
-
-						item_attr_ = item_attr;
-
-						_m_draw();
-					}
-				}
-			private:
-				void _m_draw()
-				{
-					item_r_.x = item_r_.y = 0;
-					item_r_.width = placer_->item_width(*this->graph_, item_attr_);
-					item_r_.height = placer_->item_height(*this->graph_);
-
-					comp_attribute_t attr;
-					if(comp_attribute(component::text, attr))
-					{
-						nana::paint::graphics item_graph(item_r_.width, item_r_.height);
-						item_graph.typeface(graph_->typeface());
-
-						auto bgcolor = widget_->background();
-						auto fgcolor = widget_->foreground();
-						renderer_->bground(item_graph, bgcolor, fgcolor, this);
-						renderer_->expander(item_graph, bgcolor, fgcolor, this);
-						renderer_->crook(item_graph, bgcolor, fgcolor, this);
-						renderer_->icon(item_graph, bgcolor, fgcolor, this);
-						renderer_->text(item_graph, bgcolor, fgcolor, this);
-
-						item_graph.paste(attr.area, *graph_, 1, 1);
-						graph_->rectangle(0x0, false);
-					}
-				}
-			private:
-				// Implementation of drawer_trigger
-				void attached(widget_reference wd, graph_reference graph) override
-				{
-					widget_ = &wd;
-					graph_ = &graph;
-					graph.typeface(widget_->typeface());
-				}
-			private:
-				// Implementation of compset_interface
-				virtual const item_attribute_t& item_attribute() const override
-				{
-					return item_attr_;
-				}
-
-				virtual bool comp_attribute(component_t comp, comp_attribute_t& comp_attr) const override
-				{
-					comp_attr.area = item_r_;
-					return placer_->locate(comp, item_attr_, &comp_attr.area);
-				}
-			private:
-				::nana::paint::graphics * graph_;
-				::nana::pat::cloneable<renderer_interface> renderer_;
-				::nana::pat::cloneable<compset_placer_interface> placer_;
-				widget	*widget_;
-				item_attribute_t item_attr_;
-				nana::rectangle item_r_;
-			};//end class tlwnd_drawer
-
-			class tooltip_window
-				: public widget_object<category::root_tag, tlwnd_drawer>
-			{
-			public:
-				tooltip_window(window wd, const rectangle& r)
-					: widget_object<category::root_tag, tlwnd_drawer>(wd, false, rectangle(r).pare_off(-1), appear::bald<appear::floating>())
-				{
-					API::take_active(handle(), false, nullptr);
-				}
-
-				drawer_trigger_t & impl()
-				{
-					return get_drawer_trigger();
-				}
-			};//end class tooltip_window
+			class tooltip_window;
 
 			//item_locator should be defined before the definition of basic_implement
 			class trigger::item_locator
@@ -1541,6 +1455,7 @@ namespace nana
 				}
 			};//end class tooltip_window
 
+
 			//class trigger
 				//struct treebox_node_type
 					trigger::treebox_node_type::treebox_node_type()