This patch to Tix.py provides the basic functionality
needed for the tixGrid widget to work in Tix
applications.  As I unravel the Tix C / Tcl/Tk code and
find out what more functionality is available, I will
update the patch.

There will be an associated patch providing a module to
be used with tixwidgets.py as a demo.

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Here follows code (testgrid.py) I use to test the patched
Tix.py, used as 'python -i testgrid.py'

###
import Tix as tk
from pprint import pprint

r= tk.Tk()
r.title("test")

l=tk.Label(r, name="a_label")
l.pack()

class MyGrid(tk.Grid):
    def __init__(self, *args, **kwargs):
        kwargs['editnotify']= self.editnotify
        tk.Grid.__init__(self, *args, **kwargs)
    def editnotify(self, x, y):
        return True

g = MyGrid(r, name="a_grid", selectunit="cell")
g.pack(fill=tk.BOTH)
for x in xrange(5):
    for y in xrange(5):
        g.set(x,y,text=str((x,y)))

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Accepting this patch closes bug 1036406.

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That patch can't be right: it introduces empty function
selection_adjust etc. These functions should, of course,
invoke the underlying widget commands.

Please provide a patch that can be used as-is. It might be
incomplete (i.e. not expose all functionality), but for the
functionality it provides, it should be correct.

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You are right.  Changed empty functions to comments similar
to those pre-existing in order to mark missing
functionality. New patch provided.

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Thanks for the patch. Applied as r45229.