I tried the following and it worked just fine:
#!/usr/bin/winperl
use warnings;
use strict;
use Tk;
use Tk::ProgressBar;
my $w = MainWindow->new();
my $p = $w->ProgressBar(
-blocks => 1,
-width => 20,
-length => 200,
-from => 0,
-to => 100,
-variable => \(my $foo),
)->pack();
$foo = 0;
$w->repeat(10, sub { $foo = ($foo + 1) % 100 });
MainLoop;
bbfu
Black flowers blossom
Fearless on my breath
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