Hide products from others in Bugzilla

I want to hide some products from a group of users. I set up the groups and products in the editproducts.cgi configuration. In the groupcontrols I set the "to hide" products to NA/NA but that have no effect. In the search-dialog (the products-dropdown on query.cgi) there is still a list of all products.

How can I hide these products (which the user is not member of) from the user?

EDIT: I use Bugzilla 4.0.2

Solution

I've found a combination which had this effect:

permission settings