Hi all, I am designed some GUI, there i need to disable and enable the buttons and optionmenus , if i selects one in option-menu the second button should get active till then it should be disable, how can i do it........can you please help me, here is some code ....

#!/usr/bin/perl -w
use Tk;
 my $mw = MainWindow->new();
    $mw-> geometry("400x100");
   $mw -> configure(
                -background => "cyan",
                -foreground => "lightblue"
);


 my ($var, $tvar);
 my $opt = $mw->Optionmenu(
        -background => "lightgreen",
        -options => [[jan=>1], [feb=>2], [mar=>3], [apr=>4]],
        -command => sub { print "got: ", shift, "\n" },
        -variable => \$var,
        -textvariable => \$tvar
       )->pack;

 $opt->addOptions([may=>5],[jun=>6],[jul=>7],[aug=>8]);

 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');

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

my $opt1 = $mw->Optionmenu(
        -background => "lightgreen",
        -options => [qw(test1 test2 test3)],
        -command => sub { print "got: ", shift, "\n" },
       # -variable => \$var,
        #-textvariable => \$tvar
       )->pack;

 MainLoop;
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