"Robin Becker" <robin at jessikat.fsnet.co.uk> wrote in message
news:g44pZKATy8B7Ewa2 at jessikat.fsnet.co.uk...
...
> My solutions seem to involve elements which need to refer to the parent
> and thus create a loop.
Not sure I understand your general problem, but, regarding
this last item, have you tried the (new in 2.1) weak refs...?
Alex