Tcl::Tk and Tk are different Perl modules, so you must ask elsewhere, but many questions have very same answer, as these have many in common: they provide same thing to user but have different way of embedding Tk into module. IMO Tcl::Tk is better to use due to more flexibility you get. As to your direct question, you can try asking your question Tcl people, at ActiveTcl@listserv.ActiveState.com or even better at their TCT ML