If I create a ZClass, ZC1, that subclasses ZClasses: ObjectManager and then create another, ZC2, that subclasses ZC1. As long as I don't save changes in the subobjects tab of ZC2, it will inherit the subobjects settings from ZC1. But as soon as I do save any changes, there is then no way to unset the subobjects and return it to the inherited subobjects. I think the way to do this would be to write a python method of my python base ZClass that calls the delClassAttr method from ZClasses.ZClass. But I can't seem to get this to work. Below are my python files: #!/usr/bin/python # Products/ZCapitalProjects/ZCPBases.py from ZClasses.ObjectManager import ObjectManager, ZObjectManagerPropertySheets from Products.ZCatalog.CatalogPathAwareness import CatalogAware from OFS.PropertyManager import PropertyManager class ZClassBases ( CatalogAware, ObjectManager, PropertyManager ) : """ Base Classes for all ZCP ZClasses """ pass class ZCPBases : """Mix-in for Bases """ _zclass_=ZClassBases propertysheets=ZObjectManagerPropertySheets() manage_options=( {'label': 'Subobjects', 'action' :'propertysheets/subobjects/manage'}, ) def inheritSubobjects( self ) : """ Delete the meta_types attribute in _zclass so that the class will inherit """ self.delClassAttr( self, 'meta_types' ) #!/usr/bin/python # Products/ZCapitalProjects/__init__.py from ZClasses import createZClassForBase from ZCPBases import ZCPBases from PartBase import PartBase from Part import Part from SitePart import SitePart from ProjectPart import ProjectPart from Site import Site from Project import Project from ProjectsContainer import ProjectsContainer createZClassForBase( PartBase, globals(), 'ZCPPartBase' ) createZClassForBase( Part, globals(), 'ZCPPart' ) createZClassForBase( SitePart, globals(), 'ZCPSitePart' ) createZClassForBase( ProjectPart, globals(), 'ZCPProjectPart' ) createZClassForBase( Site, globals(), 'ZCPSite' ) createZClassForBase( Project, globals(), 'ZCPProject' ) createZClassForBase( ProjectsContainer, globals(), 'ZCPProjectsContainer' ) def initialize( context ) : context.registerZClass( ZCPBases ) ----------------------------------------------------------------- | Ross Patterson rossp@cats.ucsc.edu | | Programmer/Analyst (831)459-2792 | | Physical Planning & Construction Fax:(831)423-7436 | | UC Santa Cruz http:www2.ucsc.edu/ppc | -----------------------------------------------------------------