ArdourCanvas::Group* canvas_display () { return _canvas_display; }
ArdourCanvas::Group* canvas_background () { return _canvas_background; }
ArdourCanvas::Group* ghost_group () { return _ghost_group; }
ArdourCanvas::Group* canvas_display () { return _canvas_display; }
ArdourCanvas::Group* canvas_background () { return _canvas_background; }
ArdourCanvas::Group* ghost_group () { return _ghost_group; }