The example I gave above works with a Scrolled Text widget as well. Just change the line
my $txt = $mw->Text()->pack(-side => 'top');
#to
my $txt = $mw->Scrolled('Text')->pack(-side => 'top');
Another option is to bind mouse button 3 ( right click ) to the $mw to do your change. Supressing the Text menu is up to you.
#!/usr/bin/perl
use Tk;
my $mw = MainWindow->new;
my $txt = $mw->Scrolled('Text')->pack(-side => 'top');
$mw->bind('<Button-3>', sub { print "main control 3 \n" });
MainLoop;
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