[Zope] Whoa there! What's up WebDAV???

I'm just experimenting with Dreamweaver MX + WebDAV + Zope for the first time. When I open up a Zope Page Template (ZPT), all my TAL syntax disappears. And then when I go back to Zope's ZMI and look at the ZPT, indeed all my TAL expressions are completely wiped out!! What's up with that? I think this defeats the whole purpose of being able to edit ZPT's through Dreamweaver+WebDAV, no? I want to retain the TAL expression syntax round-trip back and forth from Dreamweaver. Is there a way to do this / "fix" this ?? Thanks, Bryan