The menubar is the application's top-level menu, normally displayed horizontally at the top of the main frame.
Menubars should normally (since
Tk 8.0 onwards) be created through configuring a
menu to be in that role using the
-menu option to the
toplevel for which a menubar is to be installed. The way in which that will work depends on the platform.
tklib has a menubar package with a convenient syntax for specifying menus. See the manual:
menubar(n)
and
examples/menubar/demo.tcl in the repository (note: link is to 20140716 version of demo.tcl).
incr tcl's
iwidgets has another menubar package,
documented here.
There are a couple of lightweight wrappers for specifying menus floating around the wiki as well:
m+ is a nice example, and the
menu page has links to more.
