Hi zentara. That's nice++. Prima is new to me. I tried calling $btn1->text to obtain the string and that works too.

my $timer = Prima::Timer->create(
   timeout => 100, onTick => sub {
      my $new_text = $msg->get;
      if ($new_text ne $btn1->text) {
         $btn1->set( text => $msg->get );
      }
   }
);
[download]