Well just for your information, Gtk2 has the ability

#!/usr/bin/perl
use warnings;
use strict;
use Gtk2::TrayIcon;

Gtk2->init;

my $icon= Gtk2::TrayIcon->new("test");
$icon->add( Gtk2::Label->new("test") );
$icon->show_all;

Gtk2->main;
[download]

See Wooty for a little more pizazz.

Now Gtk2 and Tk mainloops can be made to work together, so that may give you an option. Basically, you make a Tk timer to update the Gtk2 loop every 10 millisecs. You can do the reverse too .... let a Gtk2 timer do a $mw->update every so often.

#!/usr/bin/perl -w
use strict;
use Gtk2;
use Tk;

my $mw = MainWindow->new(-title=>'Tk Window');

Gtk2->init;

my $window = Gtk2::Window->new('toplevel');
$window->set_title('Gtk2 Window');
my $glabel = Gtk2::Label->new("This is a  Gtk2 Label");
$window->add($glabel);
$window->show_all;

my $tktimer = $mw->repeat(10, sub{      
   Gtk2->main_iteration while Gtk2->events_pending;
  });

$mw->Button(-text=>'     Quit     ',
       -command => sub{exit}
        )->pack();

MainLoop;
[download]

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