[Zope] html method called from html document?

Hello All, Is this bug or feature- when i call html method from html document, html method is treated as html document. For example I have an html method called "standard_html_header" in which I have <dtml-tree... tag but it shows up only when called from index_html method, but if my index_html is Document tree does not show up :(. And one more thing- when I made some script error in index_html Document, my header rendered fine, only the rest of the document was fuc*ed up, when i fixed my error, the whole thing started treating "standard_html_header" as a Document again :( Best regards, Ainis mailto:ainis@mindless.com