korganizer, kolab : manage ACL

Using KDE 4.7.4 / Fedora 16

Hello,

I set up a kolab IMAP account in kontact and mail / remote contacts list / 
remote agenda work as expected.

My single problem lies with managing ACL regarding a remote calendar. The 
folder properties dialog after clicking on the agenda item in the korg module 
does not have a tab to manage ACL. This tab does exist with folder properties 
of a contact book and of course regarding a mailbox.

How should we proceed to manage the Access Control List of a calendar ?

Thanks in advance.
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