[Zope] Permissions on Z MySQL Database connection

I am trying to secure a Z MySQL Database connection. Specifically, I don't want anyone other than the Owner to be able to see the Properties page (since that contains database password details). I've tried changing various permissions but none do what I want. "Change Database Connections" controls changing the connection on the Properties page but doesn't prevent viewing. "View Management screens" controls access to the Status page. "View", "Manage properties", "Access contents information" have no obvious effect. Could anyone provide any suggestions? Thanks Cameron