[Mediawiki-l] access control to pages problem

[empirium]

Hello , I have Mediawiki 1.9 working with extension accesscontrol 0.7, 
because I would like to control users access to mediawiki pages.
Everything works fine but I have one problem.
When I put for example in a pages 
<accesscontrol>Some_Group</accesscontrol>, the group "Some_Group" has 
access to read and edit  that page and it is ok, but I don't want to 
that they can change  access permission to that page by editing tag 
<accesscontrol>.. I would like to that only Administrators have 
possibility to change  control  access to pages, it is possible using 
extension accesscontrol, or i should use another way to do this?
thanks in advance
luk