// define a derived class to override SetBitmap() and also to provide
// InitButtonContentInfo() helper used by CreateBitmapButton()
// define a derived class to override SetBitmap() and also to provide
// InitButtonContentInfo() helper used by CreateBitmapButton()
private:
// helper function: returns true if the given bitmap is of one of standard
// sizes supported by OS X icons
private:
// helper function: returns true if the given bitmap is of one of standard
// sizes supported by OS X icons