How do I give a user permission to edit a group?

Hi, One of my users wants to control the people that get edit access to his area without coming to me each time. I figured the easiest method of doing this would be: a) Create a group XWiki.MyGroup b) Give the controlling user "edit" or "admin" access to XWiki.MyGroup so he can edit it c) Set the ACL on the space so that XWiki.MyGroup has view and edit permissions a) Create a document that does a $xwiki.flushcache(), make it publicly available, and put it in the group page so he can easily flush the cache when updating. The question is on (b). What permissions does the user need to that page in order to add and delete users from the group? Regards, -Adrian