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Given that Tix imports all names from Tkinter this is likely to result
in confusion.
E.g.
>>> from Tix import *
>>> print Button
Tkinter.Button
>>> print OptionMenu
Tix.OptionMenu
To get to Tkinter's OptionMenu, one needs to do something like
import Tkinter
Tkinter.OptionMenu

What is the issue that you are reporting here? There is nothing wrong
with two classes having the same name, AFAICT. That's what modules are for.

I understand your argument. Yet, I am not sure classes with the same
name are reasonable here. Tix is too intertwined with Tkinter:
E.g a Tix user user can just access Tkinter widgets via Tix:
>>> import Tix
>>> print Tix.Canvas # This is TkInter's widget
Tkinter.Canvas
>> import Tix.ComboBox #whoops, we've got Tix's combobox
Tix.ComboBox
As a matter of fact, Tix docs seem to explicitly recommend accessing
Tkinter stuff through Tix:
"""The former imports the latter, so to use Tix with Tkinter, all you
need to do is to import one module. In general, you can just import Tix,
and replace the toplevel call to Tkinter.Tk with Tix.Tk"""

I don't see the problem with the example listed in the last message. It
sounds like the Tix documentation is confirming that this is the desired
behavior.