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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)))