Thanks for giving replay, here is my code , in that two option menus , one button is there , what i want is , if the first optionmenu selected the second one get activated , if the second one get selected the exit button should get activated till then optionmenu2,exit button are disabled state how i do it please help me..........

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

my $opt = "0";
my $opt1 = "0";
my ($var, $tvar);
 $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;
$opt->configure(-state);
#$opt->configure(-state=>'disabled');

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

my $exit_but = $mw->Button(-text=>'Exit', -command=>sub{$mw->destroy})
+->pack(-side=>"bottom");
$exit_but->configure(-state);
$exit_but->configure(-state => 'disabled');
$opt1 = $mw->Optionmenu(
        -background => "lightgreen",
        -options => [qw(test1 test2 test3)],
       -command => \&do_some,
         -variable => \$var,
       )->pack;
$opt1->configure(-state);

MainLoop;

sub do_some {
                if($opt ) {
                         $exit_but -> configure(-state => 'disabled');
        } else {
                $opt->configure(-state=>'disabled');
                $opt1->configure(-state=>'active');


        }

}
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