First of all, don't use numbered variables. Use an array. Then you can use map to generate the anonymous array elements. (Oh, I renamed a few of your variables / functions to something more self-documenting.)

#!/usr/bin/winperl
use warnings;
use strict;

use Tk;

my @menu_items = splice @{[get_menu_items()]}, 0, 3;
@menu_items = ('None') unless @menu_items;

my $mw = MainWindow->new();
$mw->Label(-text => 'Right-click for menu...')->pack();

my $m = $mw->Menu(-tearoff => 0,font => "{arial} 12 {bold}",-menuitems
+ => [
  map { [Button => $_, -command => sub { replace($_) }] } @menu_items
]);

$mw->bind("<Button-3>" => sub { $m->Popup(-popover => "cursor",popanch
+or => 'nw') });


$mw->focus();
MainLoop;

sub get_menu_items {
  return qw();
#  return qw(Foo Bar Baz);
#  return qw(Foo Bar Baz Quux Zod Wibble);
}
[download]

The code to populate @menu_items is a little obfuscated, but not terribly. You could break it up into an if-else. *shrug*

bbfu
Black flowers blossom
Fearless on my breath

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