Popup menu refuses appends :-(

["Shantanu Kumar" <shantanu_k06 rediffmail com>]

Hi,

Is it possible to add menuitems to a menu at runtime? I mean, when 
the menu is already displayed. And same, is it possible to 
set/remove submenus to menuitems at runtime?

I am listing below a small program, which is a sample of what I 
have been unsuccessfully trying to do. I wanted to either add 
menuitems or set new submenus at runtime through callbacks, while 
the menu is already displayed. But not only the runtime assertion 
error shows up, also no effect is seen on the menu. Any 
pointers/guidance will be of immense help.


***************
Code listing :-
***************


#include <gtk/gtk.h>

void callback(GtkButton *button, gpointer user_data) {
    GtkMenu *submenu = (GtkMenu *) user_data;
    g_print("Adding label item to submenu...");
    gtk_menu_append(submenu,
gtk_menu_item_new_with_label("Test"));
    g_print("...adding done\n");
}

void exitfunc(GtkWidget *widget, gpointer user_data) {
    gtk_main_quit();
}

int main(int argc, char *argv[]) {
    GtkMenu *menu, *submenu;
    GtkWidget *item1, *item2;

    // initialize
    gtk_init(&argc, &argv);
    menu = (GtkMenu *) gtk_menu_new();
    submenu = (GtkMenu *) gtk_menu_new();
    item1 = gtk_menu_item_new_with_label("Item 1");
    item2 = gtk_menu_item_new_with_label("Item 2");

    // set submenus and prepare widgets
    gtk_menu_append(menu, item1);
    gtk_menu_append(menu, item2);
    gtk_menu_item_set_submenu(GTK_MENU_ITEM(item2),
GTK_WIDGET(submenu));
    gtk_menu_append(submenu, 
gtk_menu_item_new_with_label("First
subitem"));
    callback(NULL, (gpointer) submenu);

    // connect signals
    gtk_signal_connect_object(GTK_OBJECT(item2), "activate",
GTK_SIGNAL_FUNC(callback), (gpointer) submenu);
    gtk_signal_connect(GTK_OBJECT(menu), "selection-done",
GTK_SIGNAL_FUNC(exitfunc), NULL);

    // display menu and activate the loop
    gtk_widget_show_all(GTK_WIDGET(menu));
    gtk_menu_popup(menu, NULL, NULL, NULL, NULL, 0, 0);
    gtk_main();

    return 0;
}


********************************
Output from the above program :-
********************************

Adding label item to submenu......adding done
Adding label item to submenu...
Gtk-CRITICAL **: file gtkmenushell.c: line 308
(gtk_menu_shell_insert): assertion `GTK_IS_MENU_SHELL
(menu_shell)' failed.
...adding done


Thanks,
Shantanu

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