There is always a newline there in the text widget, that is how it is initialized and you cannot even delete it. If you don't type anything, the length of the content will be 1; if you type something, the length is no longer 1.

use Tk;
use Tk::Dialog;

use strict;
use warnings;

my $page1 = MainWindow->new();
my $agency_infotf = $page1 -> Scrolled('Text', -scrollbars=> 'e', -wid
+th=> 25, -height=>1)->pack;
my $button = $page1->Button(-text => "Click", -command => \&verify)->p
+ack();
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();
    }
}
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