I've been banging my head against some real weirdness with implementing my
own TreeModel with editable cells, particularly with editableCells showing
up where they shouldn't, even overlapping, and also problems with
selections.  I made a bug report on one of the minor problems I've been
having (EditableCells offset to the left):

http://bugzilla.gnome.org/show_bug.cgi?id=101748

I did a google search and found this old message 

http://www.daa.com.au/pipermail/pygtk/2001-December/002227.html

which seems to indicate that there are fundamental problems with the
GenericTreeModel (but that was a year ago).  Should I keep trying to get it
to work?  However, I definitely can't say that my code isn't at fault as I
don't understand the API completely, particulary exactly when some signals
need to be emitted (row_changed, row_has_child_toggled, row_inserted).
  
I'll try to bang together a simplified python test program for this that
might demonstrate the problems.

Dave Cook
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