Gtk::TreeModelColumn<boost::shared_ptr<ARDOUR::Route> > route;
Gtk::TreeModelColumn<std::string> label;
Gtk::TreeModelColumn<bool> selected;
Gtk::TreeModelColumn<boost::shared_ptr<ARDOUR::Route> > route;
Gtk::TreeModelColumn<std::string> label;
Gtk::TreeModelColumn<bool> selected;
Gtk::RadioButton::Group source_group;
Gtk::RadioButton region_contents_button;
Gtk::RadioButton track_output_button;
Gtk::RadioButton::Group source_group;
Gtk::RadioButton region_contents_button;
Gtk::RadioButton track_output_button;