You could try something like this: A Scrolled Pane filled with checkboxes. You may need to test the height of your font, to get the right height for the Pane, I just hardcoded in 45. Also remember, you need a minimum Pane height to show the scrollbar arrows, unless you make your own custom ones.

#!/usr/bin/perl
use warnings;
use strict;
use Tk;
require Tk::Pane;

my $mw = MainWindow->new;

my $text = $mw->Scrolled("Text", 
         -relief => 'sunken', 
         -borderwidth => 2, 
         -setgrid => 1,
         -height => 10, 
         -width => 20,
         -scrollbars => 'oe')->pack();

$mw->Label(-text=>'Select from choices below')->pack();

my $pane = $mw->Scrolled('Pane',
                  -height => 45,
                  -bg => 'lightgreen',
                  -scrollbars=>'osoe',
                  )->pack(-fill => 'x',-expand=>'yes');


for my $choice(1..30){

    my $b1 = $pane->Checkbutton(
        -text     => $choice,
        -relief   => 'flat',
        -command=> sub{
           $text->insert('end',"$choice\n");
        },
    )->pack(-side => 'top', -pady => 1 ,-anchor => 'w');


}

$pane->focus;
MainLoop;
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