+ // this method is used to draw the items background and, maybe, a border
+ // around it
+ //
+ // the base class version implements a reasonable default behaviour which
+ // consists in drawing the selected item with the standard background
+ // colour and drawing a border around the item if it is either selected or
+ // current
+ virtual void OnDrawBackground(wxDC& dc, const wxRect& rect, size_t n) const;