[Zope-dev] UTF-8 manage_editForm in ZMI

Hi, I'm making some types for Plone, thus I need UTF-8 support in the "Edit" ZMI tab for that types. I have tried to start the manage_editForm.dtml with... <dtml-call "RESPONSE.setHeader('Content-Type', 'text/html; charset=UTF-8')"> But this doesn't seem to be change anything, and the ZMI edit tab is always considered encoded using the default browser setting. On Mozilla as well as with IE. Did I forget something or does the browser behave like this because the ZMI tab is an HTML frame ? Thanks in advance for any hint. --Gilles