[Zope] Undo machinery and OOBtrees

[Alec Mitchell]

Hello,

	I hav a python product that I'm working on which contains a content class 
which uses OOBtrees and OOSets internally for storing structured data.  The 
problem is that changes to this object which involve those structures do not 
seem to be undoable (i.e. no transaction shows up in the manage_undo or 
manage_change_history_page of the instance or its parent).  I've tried 
explicity using get_transaction() to commit and annotate the transaction, and 
the note seems to end up in the Data.fs, but the transaction still does not 
appear.  Are those datatypes not subject to transactions in the usual manner?  
Is there a way around this?  Should I just use dictionaries and _p_changed if 
I want to track revisions?  Thanks in advance for any enlightenment on these 
issues.

Alec Mitchell