diff --git a/kiwano/2d/Canvas.cpp b/kiwano/2d/Canvas.cpp
index 55d88987..378c2bab 100644
--- a/kiwano/2d/Canvas.cpp
+++ b/kiwano/2d/Canvas.cpp
@@ -132,6 +132,7 @@ namespace kiwano
 		text_style_ = text_style;
 
 		text_renderer_->SetTextStyle(
+			1.f,
 			DX::ConvertToColorF(text_style_.color),
 			text_style_.outline,
 			DX::ConvertToColorF(text_style_.outline_color),
diff --git a/kiwano/2d/DebugNode.cpp b/kiwano/2d/DebugNode.cpp
index 7cbfe1a5..0153fe9f 100644
--- a/kiwano/2d/DebugNode.cpp
+++ b/kiwano/2d/DebugNode.cpp
@@ -29,9 +29,15 @@
 namespace kiwano
 {
 	DebugNode::DebugNode()
+		: background_color_(0.0f, 0.0f, 0.0f, 0.7f)
 	{
+		SetName(L"kiwano-debug-node");
+		SetPosition(10, 10);
+		SetResponsible(true);
+		SetCascadeOpacityEnabled(true);
+
 		debug_text_ = new Text;
-		debug_text_->SetPosition(20, 20);
+		debug_text_->SetPosition(10, 10);
 		this->AddChild(debug_text_);
 
 		Font font;
@@ -43,6 +49,11 @@ namespace kiwano
 		style.wrap = false;
 		style.line_spacing = 20.f;
 		debug_text_->SetStyle(style);
+
+		AddListener(Event::MouseHover, [=](const Event&) {
+			SetOpacity(0.4f);
+			});
+		AddListener(Event::MouseOut, [=](const Event&) { SetOpacity(1.f); });
 	}
 
 	DebugNode::~DebugNode()
@@ -51,11 +62,10 @@ namespace kiwano
 
 	void DebugNode::OnRender()
 	{
-		Renderer::Instance()->SetTransform(Matrix{});
-		Renderer::Instance()->GetSolidColorBrush()->SetColor(D2D1::ColorF(0.0f, 0.0f, 0.0f, 0.5f));
+		Renderer::Instance()->GetSolidColorBrush()->SetColor(DX::ConvertToColorF(background_color_));
 
-		Renderer::Instance()->GetD2DDeviceResources()->GetDeviceContext()->FillRectangle(
-			D2D1_RECT_F{ 10, 10, 30 + debug_text_->GetLayoutSize().x, 30 + debug_text_->GetLayoutSize().y },
+		Renderer::Instance()->GetD2DDeviceResources()->GetDeviceContext()->FillRoundedRectangle(
+			D2D1::RoundedRect(DX::ConvertToRectF(GetBounds()), 5.f, 5.f),
 			Renderer::Instance()->GetSolidColorBrush()
 		);
 	}
@@ -73,8 +83,11 @@ namespace kiwano
 		std::wstringstream ss;
 		ss << "Fps: " << frame_time_.size() << std::endl;
 
-#ifdef KGE_DEBUG
-		ss << "Objects: " << Object::__GetTracingObjects().size() << std::endl;
+#if defined(KGE_DEBUG)
+		if (Object::IsTracingLeaks())
+		{
+			ss << "Objects: " << Object::__GetTracingObjects().size() << std::endl;
+		}
 #endif
 
 		ss << "Render: " << Renderer::Instance()->GetStatus().duration.Milliseconds() << "ms" << std::endl;
@@ -86,6 +99,7 @@ namespace kiwano
 		ss << "Memory: " << pmc.PrivateUsage / 1024 << "kb";
 
 		debug_text_->SetText(ss.str());
+		SetSize(Size{ 20 + debug_text_->GetLayoutSize().x, 20 + debug_text_->GetLayoutSize().y });
 	}
 
 }
diff --git a/kiwano/2d/DebugNode.h b/kiwano/2d/DebugNode.h
index 28c2cd97..40c0cf12 100644
--- a/kiwano/2d/DebugNode.h
+++ b/kiwano/2d/DebugNode.h
@@ -24,7 +24,7 @@
 namespace kiwano
 {
 	class KGE_API DebugNode
-		: public Node
+		: public VisualNode
 	{
 	public:
 		DebugNode();
@@ -36,7 +36,8 @@ namespace kiwano
 		void OnUpdate(Duration dt) override;
 
 	protected:
-		TextPtr				debug_text_;
+		Color		background_color_;
+		TextPtr		debug_text_;
 		Array<Time>	frame_time_;
 	};
 }
diff --git a/kiwano/2d/Text.cpp b/kiwano/2d/Text.cpp
index ec382941..f3ef601c 100644
--- a/kiwano/2d/Text.cpp
+++ b/kiwano/2d/Text.cpp
@@ -304,6 +304,7 @@ namespace kiwano
 		if (text_layout_)
 		{
 			Renderer::Instance()->SetTextStyle(
+				GetDisplayedOpacity(),
 				style_.color,
 				style_.outline,
 				style_.outline_color,
diff --git a/kiwano/base/Object.cpp b/kiwano/base/Object.cpp
index 8f2e073f..2c6927fe 100644
--- a/kiwano/base/Object.cpp
+++ b/kiwano/base/Object.cpp
@@ -95,6 +95,11 @@ namespace kiwano
 			name.c_str(), GetObjectID(), GetRefCount(), GetName().c_str());
 	}
 
+	bool Object::IsTracingLeaks()
+	{
+		return tracing_leaks;
+	}
+
 	void Object::StartTracingLeaks()
 	{
 		tracing_leaks = true;
diff --git a/kiwano/base/Object.h b/kiwano/base/Object.h
index 3ab1cd05..d264d3b2 100644
--- a/kiwano/base/Object.h
+++ b/kiwano/base/Object.h
@@ -51,6 +51,8 @@ namespace kiwano
 		String DumpObject();
 
 	public:
+		static bool IsTracingLeaks();
+
 		static void StartTracingLeaks();
 
 		static void StopTracingLeaks();
diff --git a/kiwano/platform/Application.cpp b/kiwano/platform/Application.cpp
index 5c79b207..562fa2eb 100644
--- a/kiwano/platform/Application.cpp
+++ b/kiwano/platform/Application.cpp
@@ -22,7 +22,6 @@
 #include "modules.h"
 #include "../base/logs.h"
 #include "../base/input.h"
-#include "../base/Event.hpp"
 #include "../renderer/render.h"
 #include "../2d/Scene.h"
 #include "../2d/DebugNode.h"
@@ -135,6 +134,8 @@ namespace kiwano
 		curr_scene_.Reset();
 		debug_node_.Reset();
 
+		OnDestroy();
+
 		if (inited_)
 		{
 			inited_ = false;
@@ -147,10 +148,12 @@ namespace kiwano
 		}
 
 		// Destroy all instances
-		Renderer::Destroy();
 		Input::Destroy();
+		Renderer::Destroy();
 		Window::Destroy();
-		Logger::Destroy();
+
+		// DO NOT destroy Logger instance manually
+		// Logger::Destroy();
 	}
 
 	void Application::Use(Component* component)
@@ -234,6 +237,15 @@ namespace kiwano
 		}
 	}
 
+	void Application::Dispatch(Event& evt)
+	{
+		if (debug_node_)
+			debug_node_->Dispatch(evt);
+
+		if (curr_scene_)
+			curr_scene_->Dispatch(evt);
+	}
+
 	void Application::Update()
 	{
 		static auto last = Time::Now();
@@ -381,7 +393,7 @@ namespace kiwano
 				evt.key.code = static_cast<int>(wparam);
 				evt.key.count = static_cast<int>(lparam & 0xFF);
 
-				app->curr_scene_->Dispatch(evt);
+				app->Dispatch(evt);
 			}
 		}
 		break;
@@ -394,7 +406,7 @@ namespace kiwano
 				evt.key.c = static_cast<char>(wparam);
 				evt.key.count = static_cast<int>(lparam & 0xFF);
 
-				app->curr_scene_->Dispatch(evt);
+				app->Dispatch(evt);
 			}
 		}
 		break;
@@ -429,7 +441,7 @@ namespace kiwano
 				else if (msg == WM_RBUTTONDOWN || msg == WM_RBUTTONUP) { evt.mouse.button = MouseButton::Right; }
 				else if (msg == WM_MBUTTONDOWN || msg == WM_MBUTTONUP) { evt.mouse.button = MouseButton::Middle; }
 
-				app->curr_scene_->Dispatch(evt);
+				app->Dispatch(evt);
 			}
 		}
 		break;
@@ -449,7 +461,7 @@ namespace kiwano
 					Event evt(Event::WindowResized);
 					evt.win.width = LOWORD(lparam);
 					evt.win.height = HIWORD(lparam);
-					app->curr_scene_->Dispatch(evt);
+					app->Dispatch(evt);
 				}
 
 				Window::Instance()->UpdateWindowRect();
@@ -467,7 +479,7 @@ namespace kiwano
 				Event evt(Event::WindowMoved);
 				evt.win.x = x;
 				evt.win.y = y;
-				app->curr_scene_->Dispatch(evt);
+				app->Dispatch(evt);
 			}
 		}
 		break;
@@ -482,7 +494,7 @@ namespace kiwano
 			{
 				Event evt(Event::WindowFocusChanged);
 				evt.win.focus = active;
-				app->curr_scene_->Dispatch(evt);
+				app->Dispatch(evt);
 			}
 		}
 		break;
@@ -495,7 +507,7 @@ namespace kiwano
 			{
 				Event evt(Event::WindowTitleChanged);
 				evt.win.title = reinterpret_cast<const wchar_t*>(lparam);
-				app->curr_scene_->Dispatch(evt);
+				app->Dispatch(evt);
 			}
 		}
 		break;
@@ -532,11 +544,9 @@ namespace kiwano
 			if (app->curr_scene_)
 			{
 				Event evt(Event::WindowClosed);
-				app->curr_scene_->Dispatch(evt);
+				app->Dispatch(evt);
 			}
 
-			app->OnDestroy();
-
 			::PostQuitMessage(0);
 			return 0;
 		}
diff --git a/kiwano/platform/Application.h b/kiwano/platform/Application.h
index 840b8c08..0cd7f9c8 100644
--- a/kiwano/platform/Application.h
+++ b/kiwano/platform/Application.h
@@ -23,6 +23,7 @@
 #include "../base/time.h"
 #include "../base/window.h"
 #include "../base/Component.h"
+#include "../base/Event.hpp"
 
 namespace kiwano
 {
@@ -127,6 +128,9 @@ namespace kiwano
 			bool show = true
 		);
 
+		// 分发事件
+		void Dispatch(Event& evt);
+
 		// 在 Kiwano 主线程中执行函数
 		// 当在其他线程调用 Kiwano 函数时使用
 		static void PreformInMainThread(
diff --git a/kiwano/renderer/TextRenderer.cpp b/kiwano/renderer/TextRenderer.cpp
index bc0022cd..6329c327 100644
--- a/kiwano/renderer/TextRenderer.cpp
+++ b/kiwano/renderer/TextRenderer.cpp
@@ -35,6 +35,7 @@ namespace kiwano
 		STDMETHOD(CreateDeviceResources)();
 
 		STDMETHOD_(void, SetTextStyle)(
+			FLOAT opacity,
 			CONST D2D1_COLOR_F &fillColor,
 			BOOL outline,
 			CONST D2D1_COLOR_F &outlineColor,
@@ -155,8 +156,11 @@ namespace kiwano
 		, bShowOutline_(TRUE)
 		, pCurrStrokeStyle_(NULL)
 	{
-		pRT_->AddRef();
-		pRT_->GetFactory(&pFactory_);
+		if (pRT_)
+		{
+			pRT_->AddRef();
+			pRT_->GetFactory(&pFactory_);
+		}
 	}
 
 	TextRenderer::~TextRenderer()
@@ -172,15 +176,19 @@ namespace kiwano
 
 		DX::SafeRelease(pBrush_);
 
-		hr = pRT_->CreateSolidColorBrush(
-			D2D1::ColorF(D2D1::ColorF::White),
-			&pBrush_
-		);
+		if (pRT_)
+		{
+			hr = pRT_->CreateSolidColorBrush(
+				D2D1::ColorF(D2D1::ColorF::White),
+				&pBrush_
+			);
+		}
 
 		return hr;
 	}
 
 	STDMETHODIMP_(void) TextRenderer::SetTextStyle(
+		FLOAT opacity,
 		CONST D2D1_COLOR_F &fillColor,
 		BOOL outline,
 		CONST D2D1_COLOR_F &outlineColor,
@@ -192,6 +200,8 @@ namespace kiwano
 		sOutlineColor_ = outlineColor;
 		fOutlineWidth = 2 * outlineWidth;
 		pCurrStrokeStyle_ = outlineJoin;
+
+		if (pBrush_) pBrush_->SetOpacity(opacity);
 	}
 
 	STDMETHODIMP TextRenderer::DrawGlyphRun(
diff --git a/kiwano/renderer/TextRenderer.h b/kiwano/renderer/TextRenderer.h
index 1a19cac6..a213e6ee 100644
--- a/kiwano/renderer/TextRenderer.h
+++ b/kiwano/renderer/TextRenderer.h
@@ -34,6 +34,7 @@ namespace kiwano
 		);
 
 		STDMETHOD_(void, SetTextStyle)(
+			FLOAT opacity,
 			CONST D2D1_COLOR_F &fillColor,
 			BOOL outline,
 			CONST D2D1_COLOR_F &outlineColor,
diff --git a/kiwano/renderer/render.cpp b/kiwano/renderer/render.cpp
index 6a145494..d2f7f493 100644
--- a/kiwano/renderer/render.cpp
+++ b/kiwano/renderer/render.cpp
@@ -447,6 +447,7 @@ namespace kiwano
 	}
 
 	HRESULT Renderer::SetTextStyle(
+		float opacity,
 		Color const& color,
 		bool has_outline,
 		Color const& outline_color,
@@ -458,6 +459,7 @@ namespace kiwano
 			return E_UNEXPECTED;
 
 		text_renderer_->SetTextStyle(
+			opacity,
 			DX::ConvertToColorF(color),
 			has_outline,
 			DX::ConvertToColorF(outline_color),
diff --git a/kiwano/renderer/render.h b/kiwano/renderer/render.h
index b38392b1..cdd9e23b 100644
--- a/kiwano/renderer/render.h
+++ b/kiwano/renderer/render.h
@@ -124,6 +124,7 @@ namespace kiwano
 		);
 
 		HRESULT SetTextStyle(
+			float opacity,
 			const Color& color,
 			bool has_outline,
 			const Color& outline_color,