If I were you, I would switch to a Tk::Canvas. The canvas would be a single widget, and it can handle many items ( canvas widgets) with more control too, such as various enter-leave-focus bindings which you can do with the canvas. The canvas also has a "tags" method, with which you can do many tricks with the items, like raise or lower them, etc. For instance, see Tk Virtual Keyboard

If you wish to stick with the option_menu method, I suggest just having only 1 option_method widget, and change the options as needed for each invocation. Here is a simple example of how to change options.

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

my $mw = MainWindow->new();

my @opt1 = ('a'..'m');
my @opt2 = ('n'.. 'z');
my $var = 'a';
my $tvar = 'a';

my $opt = $mw->Optionmenu(
                          -command => \&show_choice,
                          -variable => \$var,
                          -textvariable => \$tvar,
                          -options => \@opt1,
                         )->pack;


$mw->Button(-text=>'Change Options',-command=>[\&change_ops, $opt])->p
+ack;

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

MainLoop;

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

sub change_ops
{
    my $op = shift;
    $tvar = 'n';
    $op->configure( -options => \@opt2 );
}
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