Hi all! Some days ago I begin this threat: http://www.mail-archive.com/zope@zope.org/msg26355.html Dieter point me to the solution and I try something like: def __bobo_traverse__(self, REQUEST, nombre): obj = getattr(self, nombre, None) if obj is None: self.REQUEST.set('TraversalRequestNameStack', self.REQUEST["TraversalRequestNameStack"] + [nombre]) resultado = self() if type(resultado) == type(unicode()): return WrapperUnicode(resultado) elif type(resultado) == type(str()): return WrapperStr(resultado) else: return resultado return obj and the wrappers: class WrapperStr(str): __roles__ = None class WrapperUnicode(unicode): __roles__ = None But when I try to launch this zope raises a NotFound exception If I inspect de content of resultado I could see an unicode string then the WrapperUnicode is used to wrap the result Can you point me where the problem is, please? Thanks a lot! -- Mis Cosas http://blogs.sistes.net/Garito