filemenu->items().push_back(Gtk::Menu_Helpers::StockMenuElem(Gtk::Stock::CLOSE,
sigc::ptr_fun(close_selected_instance)));
filemenu->items().push_back(Gtk::Menu_Helpers::SeparatorElem());
filemenu->items().push_back(Gtk::Menu_Helpers::StockMenuElem(Gtk::Stock::CLOSE,
sigc::ptr_fun(close_selected_instance)));
filemenu->items().push_back(Gtk::Menu_Helpers::SeparatorElem());