[xwiki-users] preventing registration on workspaces under xem

Hi, I'm using workspaces 1.2M1 as a virtual xwiki under xem 1.3. I have configured the XWikiServerClass object under XWikiServerServername to have the visibility property set to 'Private'. When I look at XWikiPreferences in the virtual xwiki, there are XWikiGlobalRights objects configured Deny, Groups:,Levels:Register,Users:XWikiGuest, and Deny, Groups:XWikiAllGroup, Levels: edit, register, Users: The registration form still appears on the login page, and upon filling in the fields and submitting, registration is successful. I need to not allow registration by anyone except Admin. Thanks, Dan Svoboda