[Zope] aquisition problems with subitem in pyhton product

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hello

i've two python products which subclasses Folder.Folder

One is called "Site"
The other "Topic"

there is a index_html attribute in the Site Product

code:
index_html = (DTMLFile('dtml/representation/site_index_html', globals()))

now i put a Topic product into a Site product
the Topic product itself has no index_html

if i now request the url
/theSite/theTopic/index_html

the index_html shows up, but with the attributes of the Site object
(like <dtml-var absolute_url> == /theSite)
so its the same as:
/theSite/index_html

it appears that i've got the same problem with other methods

please help

thanks in advance