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;
[download]

Here is the now working code that is closer to what I am doing...


#perl -w 
use strict;
my ($display, $progress, $percent_done, $progress_bar_set, $mw, $lblTe
+xt, $display, $line, $count);
&CreateDisplay;
$line = 1;
while ($line < 30) {
  $display->insert('0.0', "Line $line\n");
  $mw->update;
  $count = 1;
  while ($count < 50) {
    $percent_done = $count * 2;
    $mw->update;
    $count++;
    sleep 1;
  }
  $line++;
  sleep 2;
}

sub CreateDisplay {
  use Tk;
  use Tk::Text;
  $mw = MainWindow->new(-title => 'Progress bars');
  create_progressbar();
  $lblText = $mw->Label(-text=>"This is a test of multiple progress ba
+rs...")->pack(-side => 'top');
  $display = $mw->Text(-height => '25', -width => '100',)->pack(-side 
+=> 'bottom', -expand => '1', -fill => 'both');
  $display->insert('0.0', "Starting line\n");
  $mw->update;
}

sub create_progressbar {
  use Tk::ProgressBar;
  $progress = $mw->ProgressBar( # create a progress bar for reference
      -length => 100,
      -width => 20,
      -from => 0,
      -to => 100,
      -blocks => 100,
        -colors => [0, 'blue'],
      -variable => \$percent_done
   )->pack(-fill => 'x');
}
[download]

The missing ingredient was the the $mw->update after each $percent_done incremement. It worked while increasing, but just didn't when decreasing, for some reason.....

Thank you for the help,
amonotod