Something

    def _view_create(self, mem, instance, form):        schema = self.mapping_class.get_create_schema()        schema = []        addinst = Adresse()        for field in addinst.schema:            if field.name != 'flagadresse':                schema.append(field)        action = self.absolute_url() + '/create'        form = PGForm(schema=schema, action=action, mem=mem)        from_url = value=instance.aq_parent.absolute_url()        form.add_hidden(name='from_url', value=from_url)        idclient = Customer.get_client_from_zwook_session(mem['user_id'])        form.add_hidden(name='idclient', value=idclient)        return unicode(form())