ToggleButton Change Icon

["William B Carlson" <carls107 msu edu>]

I have ToggleButton, which is used to start and stop a process.  I was 
wondering if there was a way to use the stock icons (gtk-start, gtk-stop) in 
place of the Start and Stop text. 

Basically the toggle button would start out with the gtk-start icon and when 
pressed it would switch to the gtk-stop icon.  This is so I would only have 
to use one icon in the toolbar. 

my $button_start = Gtk2::ToggleButton->new('Start');
$button_start->signal_connect (toggled => sub {
              if ($_[0]->get_active) {
                 $_[0]->child->set_text ('Stop');
                 Glib::Timeout->add(2000, \&start_cb );
              } else {
                 $_[0]->child->set_text ('Start');
                }
              }); 

Thanks for your time, 

Ben