[Zope] CopySupport for my objects

I have a python product that is defined like this:: class IssueTrackerNotifyable(SimpleItem.SimpleItem, IssueTracker) and the class IssueTracker looks like this:: class IssueTracker(Folder.Folder, CatalogAware, Persistent ) The objects created with IssueTrackerNotifyable work fine as they are but I can't copy them and place them elsewhere. Not even in another IssueTracker class instance. What do I need to base-inherit to get complete CopySupport? --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.381 / Virus Database: 214 - Release Date: 2002-08-02