@todo Change this function signature to non-const.
*/
- virtual void OnDrawItem(wxDC& dc, const wxRect& rect, size_t n) const;
+ virtual void OnDrawItem(wxDC& dc, const wxRect& rect, size_t n) const = 0;
/**
The derived class must implement this method to return the height of
the specified item (in pixels).
*/
- virtual wxCoord OnMeasureItem(size_t n) const;
+ virtual wxCoord OnMeasureItem(size_t n) const = 0;
};