[Zope-CMF] addproperty to plone portal type

[Marko Kruijer]

I gave created a new portal type in plone, based on a normal document.

Now I have added a metadata element name 'picture'. 

I changed the document_edit view to have a input field for 'picture'

When I now create this new type from the site I get an attribute error
that it can't find picture.

I'm guessing that the new property is not created qwith the object but I
can't find the script that actually creates the object.

Can anyone help me out with this?