[Zope] Problem with std. user folder Authentication dialog

How do I get rid of the Login dialog sent by 'user folder'? I have a product which I want to allow public access to (without compromising my site's security), but I can't get rid of the std. Login dialog. I tried to use the calls from the Security chapter in ZopeDevGuide, but without apparent effect: calls to security.declarePublic('myMethod') don't seem to work, as far as I can tell. Any hints would be appreciated. Vio