Destroying widget in own callback

["Jeffrey Ratcliffe" <jeffrey ratcliffe gmail com>]

The attached code produces the error message when the ComboBox is changed:

GLib-GObject-CRITICAL **: g_object_notify: assertion `G_IS_OBJECT
(object)' failed at ../assertiondemo.pl line 13.

which is not surprising, given that the ComboBox is being destroyed in
its own callback.

In my application, it would be rather cumbersome to have to avoid
destroying and recreating the widget in this way. Is there any other
way of getting rid of the error message?

Regards

Jeff Ratcliffe

#!/usr/bin/perl

use warnings;
use strict;
use Gtk2 -init;

my $window = Gtk2::Window -> new;
$window -> signal_connect ( 'delete-event' => sub { Gtk2 -> main_quit } );
my $main_vbox = Gtk2::VBox -> new;
$window -> add ( $main_vbox );
update_options();
$window -> show_all;
Gtk2 -> main;


sub update_options {
 foreach ($main_vbox -> get_children) {
 $_ -> destroy;
}
 my $combob = Gtk2::ComboBox->new_text;
 foreach ( ( 1, 2, 3 ) ) {
 $combob->append_text ($_);
}
 $combob -> set_active (0);
 $combob -> signal_connect (changed => sub {
 update_options();
});
 $main_vbox -> add ($combob);
$main_vbox -> show_all;
}