#!/usr/bin/perl
use warnings;
use strict;
use Tk;

my $mw = MainWindow->new;

my $rb = 'first button';

my $rb1 = $mw->Radiobutton(-text => "Button One",
                            -value => 'button1',
                            -variable => \$rb)->pack;

my $rb2 = $mw->Radiobutton(-text => "Button Two",
                            -value => 'button2',
                            -variable => \$rb)->pack;

my $b1 = $mw->Button(-text => 'Show', -command => [ \&showRB, \$rb ])->pack;

MainLoop;

sub showRB
{
     print "Arg list is @_ \n";
     my $state_ref = shift;
     my $state = $$state_ref;
     print "$state\n";
     
     $mw->messageBox(-title => 'Status',
                     -type  => 'OK',
                     -message  => "Status is :$state:.");
}