[Zope] CMFFormController doubts

[cla]

Hi!
I'am trying to add one more field in the edit_news_form(plone)
but when i execute the script that probably stores the object
information of this new field aren't stored.
So this what i'am doing:

<----------Script---------------->
...

new_context = context.portal_factory.doCreate(context,id)
new_context.edit( text, description, text_format,new_id_field )  <-- where
new_context.plone_utils.contentEdit( new_context
                                   , id=id
                                   , title=title
                                   , description=description)
...


<------------------------------------>

So any ideas?
Can anyone say to me the differences between new_context.edit(..)
and new_context.plone_utils.contentEdit(..)?
Any good page or tutorial that talks about it?

thanks



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