This simple script may help

#!/usr/bin/perl -w

use Tk ;
use strict;

my $top = MainWindow->new;

my @words = qw(foo fum far bim baz); 

my $list = $top->ScrlListbox(-scrollbars => 'e', -width => 70) ; 
$list->pack ; 
my $label = $top->Label(-text => '');
$label->pack(-fill => 'both', -expand => 1);



$list->bind('<1>' => [sub {&showword($list, $label)} ] ) ;

grep ($list->insert('end',$_), @words) ;

MainLoop ; 

sub showword{ 
        my $w  = shift ; 
        my $lab = shift;
        my $word ; 
        $word = $w->get($w->curselection) ;
        $lab->configure(-text => $word ) ; 
}
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