Here, only two solutions :
- resource should be aquired (so no need to hide it)
- resource should not be acquired (no need to hide it too)

reviewed by romain

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31939 20353a03-c40f-0410-a6d1-a30d3c3de9de