don't display the "+ Add members" button on a composite group

If the user does not have "update" to the composite then the "+ Add members" button is not displayed.

However if they do have "update"  ( on the group ) then the user can push the button and it displays a message "Note: you cannot add members to a composite group. You can add members to one of the factors. Click more to see composite information."

This is not really helpful to a user. ( It is producing confusion. )

It seems more helpful to either:
       Have the button auto redirect the UI to the other page.  ( Not really suggested. )
     OR 

     Hide the button for composite groups regardless of Update privileges to the group. ( Please, do this. )