void add_item (ARDOUR::RouteGroup *, std::set<ARDOUR::RouteGroup*> const &, Gtk::RadioMenuItem::Group*);
void new_group ();
void set_group (ARDOUR::RouteGroup *);
void add_item (ARDOUR::RouteGroup *, std::set<ARDOUR::RouteGroup*> const &, Gtk::RadioMenuItem::Group*);
void new_group ();
void set_group (ARDOUR::RouteGroup *);