[Zope] constructor product in Zope 2.8.1

[Henny van der Linde]

Hi,

I have the following constructor for an external product I build.

def manage_addEba(dispatcher, id='eba', title='Title here',REQUEST=None):
    "Add a Basis element to a folder."
    nEba=eba(id,title)
    dispatcher.Destination()._setObject(id, nEba)
     if REQUEST is not None:
       dispatcher.manage_main(dispatcher,REQUEST)

manage_addEbaForm = DTMLFile('dtml/manage_addEbaForm', globals())


We are upgrading to Zope 2.8.1. Now I get the follwing error when I try to 
add the product (eba).

Error Type: TypeError
Error Value: unbound method manage_addEba() must be called with eba instance 
as first argument (got str instance instead)


Can anyone shed some some light on this?

Thanks,

Henny