How do I set permissions so that a forum category is HIDDEN if the user doesn't have permissions to see it?

I see a way to generate an error msg if the user doesn't have permissions and clicks on it, but we need to be able to hide it so they don't even see the categories they don't have permissions for.

cheers,

David

*BUMP*

I have the same problem.

Have a look at:
http://www.liferay.com/web/guest/community/forums/-/message_boards/message/4079315