virtual wxBitmap DoGetBitmap(State which) const;
virtual void DoSetBitmap(const wxBitmap& bitmap, State which);
virtual wxSize DoGetBitmapMargins() const;
virtual wxBitmap DoGetBitmap(State which) const;
virtual void DoSetBitmap(const wxBitmap& bitmap, State which);
virtual wxSize DoGetBitmapMargins() const;