[Zope] Turning off authentication for a zpt page

Hello, I'm using a Zope product called OpenFlowEditor and I modified one of its .zpt pages (view_process.zpt). All is well, except that I now want to allow Anonymous users to view this zpt page. I tried doing so by checking the "Anonymous" checkbox for the "View" privilege in http://myserver/OpenFlowEditor/view_process/manage_access , but still no success. Am still being asked for a username and password. Any idea on how to get this working ? Regards, Danny