strange problem with radiomenuitem

[Alexander Nagel <feuerschwanz76 web de>]

Hi all,
i created some radiomenuitem with this.

string tmp;
for (int i = 0; i<10;i++)
{
        ostringstream outStream;
        outStream << i;
        tmp = "Gruppe " +outStream.str();
        Widgets_MainWindow.menugroupitems[i] = gtk_radio_menu_item_new_with_label 
(Widgets_MainWindow.GroupList, tmp.c_str());
        gtk_menu_shell_append (GTK_MENU_SHELL (Widgets_MainWindow.menugroups), 
Widgets_MainWindow.menugroupitems[i]);
        Widgets_MainWindow.GroupList = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM 
(Widgets_MainWindow.menugroupitems[i]));
        gtk_widget_add_accelerator (Widgets_MainWindow.menugroupitems[i], "activate", 
Widgets_MainWindow.accel_group, gdk_keyval_from_name (outStream.str().c_str()), GDK_CONTROL_MASK, 
GTK_ACCEL_VISIBLE);
        gtk_widget_show (Widgets_MainWindow.menugroupitems[i]);
        g_signal_connect ((gpointer) Widgets_MainWindow.menugroupitems [i], "activate", G_CALLBACK 
(on_menugroup_items_activate), (gpointer) i);
}

(don't laugh about the stream thing. If someone could give me a hint to
make that better would be great.)

and this is the callback:
void on_menugroup_items_activate (GtkObject *object, gpointer user_data)
{
        cout << "Gruppe " << (int) user_data << endl;
}

So the callback just print the number of the chosen group.
And this work.
But....
1. During compilation i get a warning about
'cast to pointer from integer of different size'
for the g_signal_connect line. How can i avoid this?

2. It is normal that the callback is called twice?
For example if group 3 is marked and i change to 5 i get
Gruppe 3
Gruppe 5
then marking group 9
Gruppe 5
Gruppe 9
Is that normal?

3. When i choose group 1 the callback always produces
Gruppe 1
Gruppe 0
regardless from the previous group.
Why?


any ideas would be much appreciated.. 

regards
Alex