sub set_bg{

my $pixbuff  = Gtk2::Gdk::Pixbuf->new_from_file("1Zen16.png");

#set the new pixbuff in a vbox 
my $gdkwindow = $vbox1->window;

# how to get the drawable, $widget->get_parent_window 
# did not work for me 
# although the drawable seems to have 
# the identical hash # ???? 
my ($drawable, $x_offset, $y_offset) = 
            $gdkwindow->get_internal_paint_info;

print "$drawable, $x_offset, $y_offset\n";

my $gc = Gtk2::Gdk::GC->new ($gdkwindow, undef);
print "$gc\n";

$pixbuff->render_to_drawable($drawable,
                             $gc,
                             0,0,0,0,500,430,'normal',0,0);

#this was needed, to make the image actually change 
Gtk2->main_iteration while Gtk2->events_pending;

$window->show_all();
return FALSE;
}