Hi Morten, There are two ways to subclass products. You can use straightforward Python subclassing: e.g.,In your custom Product.. here is an example from Zwiff:

import Products.PythonMethod.Guarded

from Globals import HTMLFile, MessageDialog from App import Common

manage_addZwiffForm = HTMLFile('addForm',globals())

def manage_addZwiff(self, id, title, params, body, REQUEST=None): """Add A Zwiff to a folder .... just like PythonMethod.. """ it = Zwiff(id, title, params, body) self._setObject(id, it) return self.manage_main(self, REQUEST)

def handleMovieOutput(movie, RESPONSE):

fname = tempfile.mktemp()

movie.save(fname)

f = open(fname) s = f.read() f.close()

RESPONSE.setHeader('Content-type', 'application/x-shockwave-flash')

os.remove(fname)

return s

class Zwiff (Products.PythonMethod.PythonMethod.PythonMethod ):

meta_type = 'Zwiff'

def makeFunction(self, compile=0): from Products.PythonMethod.Guarded import GuardedBlock, safefuncs, theGuard if compile: self._checkCBlock(GuardedBlock) if self.errors: raise "Python Method Error", string.join(self.errors, '\n') return self._newfun(compile, {'$guard': theGuard}, __builtins__=mysafebin, _=safefuncs)

So the class Zwiff is a subclass of PythonMethod. Look at Zwiff for the full source: http://www.zope.org/Members/sspickle/Zwiff Or you can create a ZClass that subclasses from a 'base class'. To do this you've got to register the base class with the ZClass machinery (e.g., here is the code for ZCVSMixin that does this.... ZCVSMixin is a base class... CVSFolder is a full blown product that happens to be a subclass of ZCVSMixin... )

import ZCVSMixin import CVSFolder

__doc__ = ZCVSMixin.__doc__ __version__ = ZCVSMixin.__version__

def initialize(context): context.registerClass( CVSFolder.CVSFolder, constructors=(CVSFolder.manage_addCVSFolderForm, CVSFolder.manage_addCVSFolder), icon='fish.gif', ) context.registerBaseClass(ZCVSMixin.ZCVSMixin)

does that help? take care, -steve