Hi, here is another option which might be useful. You basically use 1 callback, but do something different based on the cget('Text') on the button. The $toggle is thrown in there just as an extra in case you need a global flag changed by the button.

If you think about it, you can have more than 2 options by extending the idea.

#!/usr/bin/perl
use warnings;
use strict;
use Tk;

my $toggle = 0;

my $mw = MainWindow->new(-title => "Testing ToggleButton\n");


my $button = $mw->Button(-text => "RUN",
                     -bg => 'white',
                     -command => \&toggle)->pack(-expand=>1, -fill=>'b
+oth');

MainLoop;


sub toggle{

  print $button->cget('-text'),"\n";

 if ( $button->cget('-text') eq 'RUN'){
          $button->configure(-text => 'STOP', 
                             -bg => 'yellow',
                             -activebackground => 'yellow',
                             -highlightbackground => 'yellow',
                             );
                             
                             print "Do your RUN stuff here\n";
                             
           $toggle = 1;
         }

    elsif ( $button->cget('-text') eq 'STOP'){
           $button->configure(-text => 'RUN', 
                        -bg => 'white',
                        -activebackground => 'white',
                        -highlightbackground => 'white',
                        );
                        
                        print "Do your STOP stuff here\n";
                                                                  
           $toggle = 0;
          }
}
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