[Zope] dtml-tree - Processes all banches and sub branches? How to Stop this?

[P Cowley]

Hello,
I am using a dtml-tree.  The tree automatically
queries all open branches and sub branches each time
an expansion or compression (the + or -) is pressed. 
It does this for all open branches, not just the new
one I clicked.

This is very time consuming for me.

How can I have it only query for information from the
new branch I clicked, and have it just remember the
state of the other banches without re-querying them.

I am familiar with "assume_children" and "single", but
these dont' really solve my problem.

THanks!

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