[Zope] Migrating from zope-2.6.1 with DBTab to 2.7

Hi, I'm currently working with zope-2.6.1, using DBTab product to split my database into several parts (all using FileStorage). I'd like to switch to zope-2.7, but after customizing my "etc/zope.conf" file : - Zope doesn't start when DBTab product is installed - if I remove DBTab, I can't access to my ZODB mount points because of an error message (This object from the DBTab product is broken !). Any solution ?? Thanks, Thierry