[Zope] adding additional tabs to the dtml document view zmi

hi Apologies if this is an incorrect list to post this. I'm currently using IE Editor for Zope from http://vsbabu.org/webdev/zopedev/ieeditor.html all works fine, a WYSIWYG tab appears on any *new* dtml document i create (followed the instructions and created a new ZClass derived from DTML Document). However the problem is that we have several hundred existing dtml docs and i cannot figure out how to add the tab to them, rather than creating them anew. Any advice appreiciated. Thanks dean -- Dean Hale Information Services Web Development Manager 0191 515 2424