- region_list_display.set_model (Glib::RefPtr<Gtk::TreeStore>(0));
- route_list_display.set_model (Glib::RefPtr<Gtk::TreeStore>(0));
- named_selection_display.set_model (Glib::RefPtr<Gtk::TreeStore>(0));
- edit_group_display.set_model (Glib::RefPtr<Gtk::TreeStore>(0));