- bool owns_background_group;
- bool owns_canvas_group;
- ArdourCanvas::Group* _background_group;
- ArdourCanvas::Group* _canvas_group;
- ArdourCanvas::Rectangle* canvas_rect; /* frame around the whole thing */
+ ArdourCanvas::Container* _canvas_group;
+ ArdourCanvas::Rectangle* canvas_rect; /* sample around the whole thing */