Patch <http://bugs.python.org/issue799428is a trivial (one word) fix
to a long-standing issue with Tkinter: calls to the widget method
tk_focusNext() fail with "unsubscriptable object" error.
Admittedly we've lived a long time with this bug. But the fix is so
simple and so obviously safe that it seems a shame to leave it out.
it would be especially nice to get this into the first Python 2.6
release so one could assume the fix is present if using any flavor of
2.6 or newer.
This fix is truly trivial: it just wraps a return from tk in str() to
avoid the problem of getting an object back in less-than-ancient
versions of tcl/tk.
-- Russell
