menu_item = gtk_ui_manager_get_widget(ui_manager, "/MainMenu/FileMenu/Quit");
gtk_widget_hide (menu_item);
menu_item = gtk_ui_manager_get_widget(ui_manager, "/MainMenu/Help/About");
gtk_osxapplication_insert_app_menu_item(osx_app, menu_item, 0);
menu_item = gtk_ui_manager_get_widget(ui_manager, "/MainMenu/FileMenu/Quit");
gtk_widget_hide (menu_item);
menu_item = gtk_ui_manager_get_widget(ui_manager, "/MainMenu/Help/About");
gtk_osxapplication_insert_app_menu_item(osx_app, menu_item, 0);