File: tcolour

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perl-tk 1:800.025-2
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#!/usr/local/bin/perl -w

use Tk;

my $mw = MainWindow->new;

my $t = $mw->Text(-background => 'yellow', -width => 30, -height => 10);
$t->pack(-expand => 1, -fill => 'both');

$t->insert('1.0','This is Text','Atag');
$t->tagConfigure('Atag',-background => 'green');

$mw->Button(-text => "Change Colour",
            -command => sub { $t->tagConfigure('Atag',-background => undef) }
           )->pack;

MainLoop;