static void _cbWin(WM_MESSAGE * pMsg) {

     GUI_COLOR Color;

     switch (pMsg->MsgId) {

         case WM_PAINT:

         WM_GetUserData(pMsg->hWin, &Color, );

         GUI_SetBkColor(Color);

         GUI_Clear();

         break;

         default:

         WM_DefaultProc(pMsg);

     }

 }

 /*********************************************************************

 *

 * _cbDoSomething

 */

 static void _cbDoSomething(WM_HWIN hWin, void * p) {

     int Value = *(int *)p;

     WM_MoveWindow(hWin, Value, Value);

 }

 /*********************************************************************

 *

 * MainTask

 */

 void Fun(void) {

     WM_HWIN hWin_1, hWin_2, hWin_3;

     int Value = ;

     GUI_COLOR aColor[] = {GUI_RED, GUI_GREEN, GUI_BLUE};

     GUI_Init();

     WM_SetDesktopColor(GUI_BLACK);

     hWin_1 = WM_CreateWindow( , , , , WM_CF_SHOW, _cbWin, );

     hWin_2 = WM_CreateWindowAsChild(, , , , hWin_1, WM_CF_SHOW, _cbWin, );

     hWin_3 = WM_CreateWindowAsChild(, , , , hWin_2, WM_CF_SHOW, _cbWin, );

     WM_SetUserData(hWin_1, &aColor[], );

     WM_SetUserData(hWin_2, &aColor[], );

     WM_SetUserData(hWin_3, &aColor[], );

     while () {

         WM_ForEachDesc(WM_HBKWIN, _cbDoSomething, (void *)&Value);

         Value *= -;

         GUI_Delay();

     }

 }