my @list =    ( "a", "b", "c", "d", "e", "f" );
##</code><code>##

my @list =    ( "a", "b", "c", "d", "e", "f","g" );
or perhaps    ( "a", "b", "NEW", "c", "d", "e", "f" )
or perhaps    ( "a", "b", "c")
##</code><code>##

=================================
use strict;
use warnings;
use Tk;
 
my $mw = MainWindow->new();
my $lbox = $mw->Listbox()->pack();
 
my @list = ( "a", "b", "c", "d", "e", "f" );
$lbox->insert('end', @list );

$lbox->selectionSet('2');  #default starting selection in the box,"c"

$lbox->bind('<<ListboxSelect>>', sub{warn "new ListBox element selected!\n"} );

MainLoop;