Hi I want to build a multilingual content class with LocalPropertyManager from the Localizer product. Also, my class extends the File class, something like: class MClass(LocalPropertyManager, File): title = LocalProperty('title') description = LocalProperty('description') def __init__(self, id, title, description, file, precondition, content_type, lang): File.__dict__['__init__'](self, id, title, file, content_type, precondition) self._setLocalPropValue('title', lang, title) self._setLocalPropValue('description', lang, description) The problem is that everytime I call the title property it doesn't return the LocalProperty 'title', but instead it returns the value entered when the object was created. From a ZPT, if lang is the current selected language and is 'en': <span tal:replace="here/title" /> - don't get the correct value for the selected language <span tal:replace="python:here.getLocalProperty('title', lang)" /> - correct value Not event after editing the object properties, the 'title' value remains the same: the value entered when the object was created. I tried not to call the File constructor, but it doesn't work also. My LocalProperty 'title' is somehow 'hidden'. Could you please give me some indications about what am I doing wrong? Is there another way to have a class like MClass? Thanks a lot, Dragos