Any one have any suggestion on how to get this to work with the root window?

The code below works, but it does not change it permanently. As soon as I move a window or etc, that part of the root window that was revealed goes back to the previous back ground.

sub setBGfile{
my $self=$_[0];
my $file=$_1;

Gtk2->init;

my $screen=Gtk2::Gdk::Screen->get_default;
my $window=$screen->get_root_window;

my $pixbuf=Gtk2::Gdk::Pixbuf->new_from_file($file);

my $values;
my $colormap = $screen->get_default_colormap;

my ($real_drawable, $x_offset, $y_offset) = $window->get_internal_paint_info;
my $gc = Gtk2::Gdk::GC->new ($window, undef);

$pixbuf->render_to_drawable($real_drawable, $gc,
0,0,0,0,871,1200,'normal',0,0);

Gtk2->main_iteration while Gtk2->events_pending;

return;
}