diff --git a/example/NullWindow/main.cpp b/example/NullWindow/main.cpp
index eceb322b..e6f39628 100644
--- a/example/NullWindow/main.cpp
+++ b/example/NullWindow/main.cpp
@@ -1,34 +1,10 @@
 #include<hgl/render/RenderDevice.h>
+#include<hgl/render/RenderWindow.h>
 #include<iostream>
-#include<math.h>
+#include<GLFW/glfw3.h>
 
 using namespace hgl;
 
-void put(const struct VideoMode *vm)
-{
-    std::cout<<"\t"<<vm->width<<"x"<<vm->height<<","<<vm->bit<<"bits,"<<vm->freq<<"hz";
-}
-
-void put(const struct Display *disp)
-{
-    const int inch=sqrt((disp->width*disp->width)+(disp->height*disp->height))*0.03937008;
-
-    std::cout<<"["<<disp->name.c_str()<<"]["<<disp->width<<"x"<<disp->height<<" mm,"<<inch<<" inch][offset "<<disp->x<<","<<disp->y<<"]"<<std::endl;
-
-    std::cout<<"\tcurrent video mode: ";
-    put(disp->GetCurVideoMode());
-    std::cout<<std::endl;
-
-    const ObjectList<VideoMode> &vml=disp->GetVideoModeList();
-
-    for(int i=0;i<vml.GetCount();i++)
-    {
-        std::cout<<"\t"<<i<<" : ";
-        put(vml[i]);
-        std::cout<<std::endl;
-    }
-}
-
 int main(void)
 {
     RenderDevice *device=CreateRenderDeviceGLFW();
@@ -45,27 +21,30 @@ int main(void)
         return -2;
     }
 
-    {
-        const UTF8String device_name=device->GetName();
+    WindowSetup ws;
 
-        std::cout<<"RenderDevice: "<<device_name.c_str()<<std::endl;
+    ws.Name=U8_TEXT("Null Window");
+
+    RenderSetup rs;
+
+    RenderWindow *win=device->Create(1280,720,&ws,&rs);
+
+    win->Show();
+
+    glClearColor(0,0,0,1);
+
+    while(win->IsOpen())
+    {
+        win->MakeToCurrent();
+
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        win->SwapBuffer();
+        win->PollEvent();
     }
 
-    List<Display *> disp_list;
-
-    device->GetDisplayList(disp_list);
-
-    const int count=disp_list.GetCount();
-
-    std::cout<<"Device have "<<count<<" display."<<std::endl;
-
-    for(int i=0;i<count;i++)
-    {
-        std::cout<<"Display "<<i<<" ";
-        put(GetObject(disp_list,i));
-
-        std::cout<<std::endl;
-    }
+    delete win;
+    delete device;
 
     return 0;
 }
diff --git a/inc/hgl/render/RenderDevice.h b/inc/hgl/render/RenderDevice.h
index 1d2cdcfb..ec8286e1 100644
--- a/inc/hgl/render/RenderDevice.h
+++ b/inc/hgl/render/RenderDevice.h
@@ -39,21 +39,21 @@ namespace hgl
 
     struct WindowSetup
     {
-        UTF8String Name;                                                                        ///<窗口标题
+        UTF8String Name;                                                                            ///<窗口标题
 
-//         OSString IconFilename;                                                                  ///<图标文件名称
-//         OSString CursorFilename;                                                                ///<光标文件名称
-        bool Edge;                                                                              ///<是否显示边框
+//         OSString IconFilename;                                                                   ///<图标文件名称
+//         OSString CursorFilename;                                                                 ///<光标文件名称
+        bool Edge       =true;                                                                      ///<是否显示边框
 
-        bool SysMenu;                                                                           ///<是否显示系统菜单
-        bool Right;                                                                             ///<窗口是否使用靠右风格
+        bool SysMenu    =true;                                                                      ///<是否显示系统菜单
+        bool Right      =false;                                                                     ///<窗口是否使用靠右风格
 
-        bool Resize;                                                                            ///<窗口大小是否可调整
-        bool Minimize;                                                                          ///<窗口是否可以最小化
-        bool Maximize;                                                                          ///<窗口是否可以最大化
+        bool Resize     =false;                                                                     ///<窗口大小是否可调整
+        bool Minimize   =false;                                                                     ///<窗口是否可以最小化
+        bool Maximize   =false;                                                                     ///<窗口是否可以最大化
 
-        bool TopMost;                                                                           ///<永远在最上面
-        bool AppTaskBar;                                                                        ///<程序项在任务栏显示
+        bool TopMost    =false;                                                                     ///<永远在最上面
+        bool AppTaskBar =true;                                                                      ///<程序项在任务栏显示
     };
 
     /**