#!/usr/bin/perl

use strict;
use Tk;
my $mw = MainWindow->new();

my ($var, $tvar);
my $opt = $mw->Optionmenu(
                          -command => \&show_choice,
                          -variable => \$var,
                          -textvariable => \$tvar
                         )->pack;
change_ops( $opt );

my $f = $mw->Frame(-relief=>'groove', -borderwidth => 2)->pack;
$f->Label(-textvariable=>\$tvar)->pack(-side => 'left');
$f->Label(-text => " -> ")->pack(-side => 'left');
$f->Label(-textvariable=>\$var)->pack(-side => 'left');

$mw->Button(-text=>'Change Options',-command=>[\&change_ops, $opt])->pack;
$mw->Button(-text=>'Exit', -command=>sub{$mw->destroy})->pack;

MainLoop;

sub show_choice
{
    print "got: ", shift, "\n"
}

sub change_ops
{
    my $op = shift;
    my @newoptions = map { ++$. } ( 0 .. 3 );
    $op->configure( -options => \@newoptions );
}