GUI in Windows

[morden]

Suppose I need to do some GUI on Windows. My understanding is that 
pythonTk is flaky on Windows. My top requirement is
that the toolkit is robust. The second requirement
is that the widget set is large.

I don't need anything fancy though,
buttons, comboboxes, widgets for entering text/integers/date/time/etc,
tables, groups, top and pull down menus.

If it's portable it's a plus.

Again, I want something with extensive track record and _very stable_
like pythonTk wrapper on UN*X platforms.

Thank you.