+#ifdef wxHAS_DRAW_TITLE_BAR_BITMAP
+ // Draw one of the standard title bar buttons
+ //
+ // This is currently implemented only for MSW and OS X (for the close
+ // button only) because there is no way to render standard title bar
+ // buttons under the other platforms, the best can be done is to use normal
+ // (only) images which wxArtProvider provides for wxART_HELP and
+ // wxART_CLOSE (but not any other title bar buttons)
+ //
+ // NB: make sure PNG handler is enabled if using this function under OS X
+ virtual void DrawTitleBarBitmap(wxWindow *win,
+ wxDC& dc,
+ const wxRect& rect,
+ wxTitleBarButton button,
+ int flags = 0) = 0;
+#endif // wxHAS_DRAW_TITLE_BAR_BITMAP
+
+