[Zope] Tree tag adds transaction in 2.0.0b2, bug?

I have a simple use of the tree tag -- culling data from a Sybase table -- which seems to incur a transaction. It shows up in the undo transaction log. The Sybase SQL Method on its own does not add the transaction. Nothing rendered by the tree tag is to blame, either. This shouldn't happen, should it? -- Alexander Staubo http://www.mop.no/~alex/ "QED?" said Russell. "It's Latin," said Morgan. "It means, 'So there you bastard'." --Robert Rankin, _Nostramadus Ate My Hamster_