switching images on button control (pressed and released)

...
//create two bitmaps (pressed image and released image)
__pBitmapExit = img.DecodeN(btnExitPath, 
            BITMAP_PIXEL_FORMAT_ARGB8888);
TryReturn(GetLastResult()==E_SUCCESS,GetLastResult(), 
            GetErrorMessage(GetLastResult()));
__pBitmapExitPressed = img.DecodeN(btnExitPressedPath, 
            BITMAP_PIXEL_FORMAT_ARGB8888);
TryReturn(GetLastResult()==E_SUCCESS,GetLastResult(), 
            GetErrorMessage(GetLastResult()));
...
//get button control 
__pButtonExit = static_cast<Button *>(GetControl(L"IDC_BUTTON2"));
 if (__pButtonExit != null)
 {
  //Sets a normal background bitmap to this Button.
  __pButtonExit->SetNormalBackgroundBitmap(*__pBitmapExit);
  //Sets a pressed background bitmap to this Button
  __pButtonExit->SetPressedBackgroundBitmap(*__pBitmapExitPressed);
  __pButtonExit->SetActionId(ID_BUTTON2);
  __pButtonExit->AddActionEventListener(*this);

 } else {
  r = E_FAILURE;
 }

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