use Tk;
use Tk::Dialog;

use strict;
use warnings;

my $page1 = MainWindow->new();
my $agency_infotf = $page1 -> Scrolled('Text', -scrollbars=> 'e', -width=> 25, -height=>1)->pack;
my $button = $page1->Button(-text => "Click", -command => \&verify)->pack();
MainLoop;
sub verify {
	my $agency_info = $agency_infotf->get('1.0', 'end');
	if (length($agency_info) == 1){
	my$dialog = $page1-> Dialog(
			  -title => 'Alert',
			-text => "Please Complete ALL the Fields on the First Tab",
			  -buttons => [ qw(OK) ])        
			->Show();
	}
}