The bindRdOnly subroutine is not doing what you think it's doing. This subroutine is called during class initialization to setup default bindings, not to introduce new ones.

You can try the following instead -
$t->bind('Tk::Text', '<Control-s>', \&save_file);

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In reply to Re: tk bindings and readonly? by Roger
in thread tk bindings and readonly? by Elijah

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