Tkinter, Menu(bar) font size

[Bob Greschke]

Option adding "Menu*font" changes the font size of the _commands, 
_radiobuttons, etc., but not the "File", "Edit", etc. labels on the menubar 
itself.  What is the name for those labels?  If I go

   Top.add_cascade(Label = "File", menu = Fi, font = "Courier 20")

they change, but I can't figure out the name for the option_add.

I'm not really trying to use Courier 20. :)

Thanks!

Bob