http://www.perlmonks.org?node_id=224415


in reply to (bbfu) (Popup() method) Re2: Center a Tk window on the screen
in thread Center a Tk window on the screen

Hmm, Mastering Perl/Tk has a section on it in Chapter 12. Otherwise, a good source of info is doing a http://groups.google.com search for "tk Popup methods"
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