[Zope] howto format/customize property sheets for zclasses ?

[chas]

good afternoon,

basic question : how does one format/customize the "properties" 
management page of a zclass instance ? 
this must be quite obvious but even after a shower i can't find 
it.

eg. say i have a zclass called "Article". creating this
    via the zope interface will automatically create the 
    following : 

       Article 
       Article_add (Article constructor) 
       Article_addForm (Article constructor input form)
Article_add_permission (Article constructor permission) 
	Article_factory (Article factory) 

    i have edited the Article_addForm dtml-document to make the
    html form better (eg. larger text areas larger with WRAP
    attributes). so, now it is easier to create a new instance
    of this zclass.

    but when somebody wishes to edit/update the properties of this
    instance, the following form is used :
    http://domain/[zclass-instance]/propertysheets/properties/manage
    
    is there a quick and easy way to over-ride this ? i'm only going
    to add a few things (like better textareas or comments for users)
    in the name of usability.

 (going back to the Lotus Notes analogy earlier,  how does one
 format/customize the "form" ?)

cheers,

chas