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class CBitmapButton : public CButton
{
...
protected:
// all bitmaps must be the same size
CBitmap m_bitmap; // normal image (REQUIRED)
CBitmap m_bitmapSel; // selected image (OPTIONAL)
CBitmap m_bitmapFocus; // focused but not selected (OPTIONAL)
CBitmap m_bitmapDisabled; // disabled bitmap (OPTIONAL)
....
};