Groups > Members>Pending> Cancel link is having grey background color.

Groups > Members.
Select radio box for "Pending."

Click Accept or Deny link.
Here, the Cancel link is having grey background color.

Issue in current.dev. ( not in dev)

http://current.dev.curriki.org/xwiki/bin/view/Group_11March09ClosedGroup/Members?type=1 [username/password: ashpee/curriki]