[Zope] persistence problem with python product

[zope-mailinglist]

hello

I made a python product class which inherits from Folder and is persistent.

Then ive made a helper class, see the listing (ive tried with and without
inheriting Persistent)
, the CommonPropertyContainer is now an attribute of a Class called Site:

class CommonPropertyContainer(Persistent):
    "a container for properties"

    def __init__(self,id,title):
        self.id=id
        self.title=title
        self._properties = {}

    def setProperty(self,id,title,value):
        self._properties[id] = {"title":title,"value":value}

    def setPropertyValue(self,id,value):
        self._properties[id]['value'] = value

    def getProperties(self):
        return self._properties.items()


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now when i change values via the setPropertyValue(method) the new values get
lost
when I restart zope
I dont know but I heard that objects used by a class which is persistent are
automatically persistent too

please help