Instead of using a tied variable, you can define a subroutine to update the button based on the parameters:

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

use Tk;

my $mw = 'Tk::MainWindow'->new;

my $states = [qw[ disabled normal ]];

my @buttons;
for my $i (0, 1) {
    $buttons[$i] = $mw->Button( -text    => "Start $states->[$i]",
                                -state   => $states->[$i],
                                -command => sub { warn "B$i" },
                              )->pack;
    $mw->Entry( -textvariable => \$states->[$i] )->pack;
}

$mw->Button( -text    => 'Apply',
             -command => sub {
                 blink($_, $states->[$_]) for 0, 1;
             } )->pack;

sub blink {
    my ($idx, $state) = @_;
    $buttons[$idx]->configure( -state => $state );
}

MainLoop();
[download]

Is it what you wanted?

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.