There's an example of this in Mastering Perl/Tk (O'Reilly - Steve Lidie & Nancy Walsh) on pages 146-148. Boiling it down, you create the scrollbar then you create an anonymous array of listboxes

my $scrollbar = $mw->Scrollbar(-orient => 'vertical);
my $raListboxes = [ $mw->Listbox(), $mw->Listbox() ];
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Then you create a subroutine that will do the scrolling

sub scrollListboxes
{
    my ($scrollbar, $scrolled, $raListboxes, @args) = @_;
    $scrollbar->set(@args);
    my ($top, $bottom) = $scrolled->yview();
    foreach my $listbox ( @$raListboxes )
    {
        $listbox->yviewMoveto($top);
    }
}
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then configure each listbox to call the routine and configure the scrollbar to scroll each listbox.

foreach my $listbox ( @$raListboxes )
{
    $listbox->configure(
       -yscrollcomand =>
       [
          \&scrollListboxes,
          $scrollbar,
          $listbox,
          $raListboxes
       ]);
}

$scrollbar->configure(
   -command => sub
   {
       foreach my $listbox ( @$raListboxes )
       {
           $listbox->yview(@_);
       }
   });
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Having set all that up you pack the widgets and away you go. I have not used this code but remembered seeing the example when I saw your post.

I hope this is of use.

Cheers,

JohnGG

Update: Corrected missing comma in 2nd line of code, thanks ikegami