main_window = glade_xml_get_widget(xml, "main_window");
g_signal_connect(main_window, "delete-event", (GCallback) main_window_on_delete_event, NULL);
main_window = glade_xml_get_widget(xml, "main_window");
g_signal_connect(main_window, "delete-event", (GCallback) main_window_on_delete_event, NULL);