[Zope] reindex_object in External method

Hi, Howto reindex a new ZClass instance (ZCalatog aware) in an External method? I tried this following code but nothing seems to be reindexed !! def addZClass(self,id,data): newob=id newob.propertysheets.Properties.manage_changeProperties(data) self._setObject(id,newob) newob.reindex_object() Bye, FR