Newly entered admin users can't access all edit modes!

Hi, I'm just evaluating Xwiki for our intranet. The authentication should be carried out using Active Directory, which actually works already. But there is one problem: As there is no user "Admin" in AD we have to assign the Admin rights for XWiki to users which are actually part of AD. So I assigned my AD id to the XWikiAdminGroup group. When logging in with my id, even without enabling the LDAP security, everything looks like I'm an administrator, so I have access to administration etc. But there is one difference to the standard Admin user: The "edit" action menu does not show the extended features "class", "objects" etc, when hovering over the menu "edit" no other choices are displayed. When entering the edit mode only the tabs "WYSIWYG", "Wiki" and "Acces Rights" are displayed. Any solution for this? Restarting the server or flushing the cache makes no differences. Thanks! Bye, Jan