You sort of have the right idea, but there is one thing to watch out for: do not try to use the widget as a hashkey, as it will result in an error. You are doing it right by assigning a counter. Here is an example based on my code example above. P.S. To make your code look better, put your listboxes into Scrolled Panes. This example needs some work to make it look right, but it demonstrates the hash idea quite nicely.

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

my $mw = MainWindow->new;
$mw->geometry(q/+100+100/);
$mw->title("Test Script");

#need exportselection=>0 for using multiple selection boxes

my %lbhash;

# you want to use the listbox to hold your
# data, so store the widget's actual object
# with the name you want to give it

my @choices = ('afg', 'dfg', 'erty', 'etc');

foreach my $choice(@choices){
    my $pane = $mw->Scrolled('Pane')->pack(-side => 'left');
    my $label = $pane->Label(-text=> $choice, -bg=>'lightseagreen')
                    ->pack(-side=>'top');
    
    $lbhash{ $choice }{'widget'} = $pane->Listbox(-bg => 'white',
                       -selectmode => 'extended',
                       -exportselection=> 0 )->pack(-side=>'bottom');

   my @random_data;
   for(1..20){push @random_data ,int rand(100) } 
  
     $lbhash{ $choice }{'widget'} ->insert( 'end', @random_data );
       
   }



$mw->Button( -text => "Selections", -command =>
     sub{ 
           
           foreach my $key( keys %lbhash ){
             
              my @selects = $lbhash{ $key }{'widget'}->curselection;
           
              print "$key: ";
           
              foreach my $select (@selects){ 
              
                 print  $lbhash{ $key }{'widget'}->get($select),' '; 
           
                }
               print "\n\n";
          }           
       }    
           )->pack( -side => 'left' );

$mw->Button( -text => "Done", -command => \&exit )->pack;

MainLoop;
[download]

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