[Zope] Overriding manage_properties in a ZClass

[Ronald L. Chichester]

I have a ZClass where I want to use my own manage_properties dtml page. 
However, when I use 

manage_properties = DTMLFile('www/manage_editForm', globals())

and then 

manage_options=(
	{'label':'Properties',  'action':'manage_properties'} ,
	...
)

The instance (which is derived from Folder) merely shows the standard
Folder properties (e.g., title only).

changing the 'action':'manage_editForm' doesn't work either.

Hints, anyone?

TIA,

Ron