clearRect

VOID clearRect( HWND hwnd )
{
   RECT rc;
    HDC  hdc;

    GetWindowRect(hwnd, &rc );
    if( rc.top >0 )
    {    rc.top=0;    }
    hdc = GetDC( hwnd ); 
    FillRect( hdc , &rc , (HBRUSH) GetStockObject(WHITE_BRUSH) );

     ReleaseDC(hwnd, hdc);    
 }/* end function */