[Zope] How to get the name of the authenticated user when writing cmf types ?

Dear People, I am coding a cmftype to be used together with Plone. My question is why can i get the user using : self.REQUEST['AUTHENTICATED_USER'].getUserName() but when i try : AccessControl.SecurityManager.getUserName() it gives me an error saying that type 'module' is uncallable ? Any help or explanation is appreciated. Thank you. __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com