To be honest, it was early, and I just pasted the first example I came across, but now that I look closer, it does have alot of fluff in it. :-)

But in my defense, I had a simple non-complicated example like yours, BUT, the OP claimed unfamiliarity with pTk, so I wanted an example that was very elementary, showing each step in excruciating newbie detail....... the adding to the listboxes, and how to get both selections with a button(or command). Also, your for() syntax is clever, but not standard, and I would hate to have a new user thinking that was a good template for setting up listboxes.

Here is how I would do a rewrite

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

my $mw = MainWindow->new();

my $f = $mw->Frame( -border => 1 )->pack( -side => "left", -fill => "b
+oth" );

#just manipulate arrays to change lists
my @list1 = ( 'a' .. 'z' );
my @list2 = ( 1 .. 100 );

my $list1 = $f->Scrolled(
   "Listbox",
   -listvariable    => \@list1,
   -scrollbars      => "osoe",
   -exportselection => 0,
   -selectmode      => "extended"
)->pack( -fill => 'both' );

my $list2 = $f->Scrolled(
   "Listbox",
   -listvariable    => \@list2,
   -scrollbars      => "osoe",
   -exportselection => 0,
   -selectmode      => "extended"
)->pack( -fill => 'both' );

$mw->Button(
   -text    => "Selections",
   -command => sub {
      my $selected1 = $list1->get( $list1->curselection );
      my $selected2 = $list2->get( $list2->curselection );
      print "selected-> $selected1 $selected2\n";
   }
)->pack( -side => 'left' );

$mw->Button( -text => "Exit", -command => sub { exit } )->pack;

MainLoop;
[download]

Thanks for your replies. Unfortunately, for reasons beyond my control, Win32::GUI is not available for me to use. What I did was take the advice of both anonymous monk and Khen1950fx, and modify the Perl module MListbox.pm:

First I added Control-c capabilities. Note that I need to account for lower case 'c' and upper case 'C', for when capslock is turned on:

sub ClassInit {
    my ($class,$mw) = @_;
    $mw->bind($class,'<Configure>',['_yscrollCallback']);
    $mw->bind($class,'<Down>',['_upDown',1]);
    $mw->bind($class,'<Up>',  ['_upDown',-1]);
    $mw->bind($class,'<Shift-Up>',  ['_extendUpDown',-1]);
    $mw->bind($class,'<Shift-Down>',['_extendUpDown',1]);
    $mw->bind($class,'<Control-Home>','_cntrlHome');
    $mw->bind($class,'<Control-End>','_cntrlEnd');
    $mw->bind($class,'<Shift-Control-Home>',['_dataExtend',0]);
    $mw->bind($class,'<Shift-Control-End>',['_dataExtend',Ev('index', 
+'end')]);
    $mw->bind($class,'<Control-slash>','_selectAll');
    $mw->bind($class,'<Control-backslash>','_deselectAll');
    $mw->bind($class,'<Control-c>','_copyAll');
    $mw->bind($class,'<Control-C>','_copyAll');
}
[download]

Then I added the following subroutine to the MListbox.pm module. Assuming I was using Khen1950fx's example, if I wanted to be copying column #6 to the clipboard:

sub _copyAll {
    my ($w) = @_;
    my @sel = $w->curselection;
    if (scalar(@sel) > 0){
        $w->clipboardClear;
        foreach(@sel){
            my ($name) = ($w->getRow($_))[6];
            $w->clipboardAppend($name);
            }
    }
}
[download]

A bit clunkish, but gets the job done. Any faster ways you can think of to get the stuff copied to the clipboard without going through a loop?