Though the invocation of this [Tk] command is [tk_menuBar], it is documented as
http://www.purl.org/tcl/home/man/tcl8.4/TkCmd/menubar.html .

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See also [incr Widgets] doc. Here's an example of the Iwidgets menubar: http://204.247.240.249/iwidgets/iwidgets/menubar.html
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Anyone have examples ?

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[Tk syntax help] - [Arts and crafts of Tcl-Tk programming]
- [Category Command], a part of the [Tk] package