Setting a custom GtkAccelLabel - c

Question

I am trying to set a custom GtkAccelLabel to my GtkMenuItem, though I cant figure out how to use that widget ... for me just nothing is displayed.
Why are the following calls wrong / not sufficient ?
...
fileMi = gtk_menu_item_new_with_label("File");
label = gtk_accel_label_new ("Strg+X");
gtk_accel_label_set_accel_widget (label, quitMi);
...
Here a complete reproducer:
int main(int argc, char *argv[]) {
GtkWidget *window;
GtkWidget *vbox;
GtkWidget *menubar;
GtkWidget *fileMenu;
GtkWidget *fileMi;
GtkWidget *quitMi;
gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 300, 200);
gtk_window_set_title(GTK_WINDOW(window), "Simple menu");
vbox = gtk_vbox_new(FALSE, 0);
gtk_container_add(GTK_CONTAINER(window), vbox);
GtkAccelGroup *accel_group;
// Create a GtkAccelGroup and add it to the window.
accel_group = gtk_accel_group_new ();
gtk_window_add_accel_group (GTK_WINDOW (window), accel_group);
menubar = gtk_menu_bar_new();
fileMenu = gtk_menu_new();
fileMi = gtk_menu_item_new_with_label("File");
quitMi = gtk_menu_item_new_with_label("Quit");
gtk_menu_item_set_submenu(GTK_MENU_ITEM(fileMi), fileMenu);
gtk_menu_shell_append(GTK_MENU_SHELL(fileMenu), quitMi);
gtk_menu_shell_append(GTK_MENU_SHELL(menubar), fileMi);
gtk_box_pack_start(GTK_BOX(vbox), menubar, FALSE, FALSE, 0);
GtkWidget *label = gtk_accel_label_new ("Strg+X");
gtk_accel_label_set_accel_widget (label, quitMi);
gtk_accel_label_refetch (label);
g_signal_connect(G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), NULL);
g_signal_connect(G_OBJECT(quitMi), "activate",
G_CALLBACK(gtk_main_quit), NULL);
gtk_widget_show_all(window);
gtk_main();
return 0;
}

Answer 1

Hah, I found a solution .. though no idea if it actually should be done like that.
The key is, that there is already a gtk_accel_label on the MenuItem, and I can modify it:
for (GList* lp = gtk_container_get_children (quitMi); lp != NULL; lp = lp->next)
{
if (GTK_IS_ACCEL_LABEL (lp->data))
gtk_accel_label_set_accel (lp->data, GDK_KEY_0, GDK_MOD1_MASK);
}