Roles and permissions

how to solve this: in main menu there are 2 database, one is "open" and can be accessed without login (or as "guest"), the other one can be accessed only after succesfull login with user name ("guest" is not allowed to read database entries).

Normal methods (grant/inherit/etc) does not work in any way, my trials was:

- globally not allow database access for guest, and specially for "open" database overwrite the default (in database settings, on "override..." tab) -> in this case none of database are accessible for guest

- globally allow database access for guest, and for the closed database restrict the database access for guest (in this case guest can access the restricted database too...)

I do not no how to solve this problem.

Other general problem: in 1.6.3 if guest want to access something which is not allowed for guest, the login window came up automatically. In 1.7 - there is no login page, just an error message, that it is not allowed to user this resource...

Any comments/ideas ?