newforms and child models

I've been trying to update some existing code to use
newforms.
My initial experiment substituting a newforms produced form
for a form
created by a custom manipulator worked fine.
However, I ran into some difficulty attempting to use a
form_for_instance produced form to substitute for a
changemanipulator.

Teardown is the model I am trying to update.
TeardownPart is a model with a foreign key referencing a
Teardown.

Using a change manipulator my template was able to access a
set of
teardownparts from the form (see template excerpt below).
When I created a new view using newforms, I attempted to use
the same
template, and found that the form.teardownpart did not seem
to exist.

Is there something one has to do differently, either in the
template
or the view, to preserve this functionality when switching
to
newforms?

Thank you,

-Philip Barkow

Excerpted from original view:
	manipulator = Teardown.ChangeManipulator(teardown_id)
	form = forms.FormWrapper(manipulator, new_data, errors)


Excerpted from newforms view:
	teardown = Teardown.objects.get(id=teardown_id)
        TeardownForm =
newforms.models.form_for_instance(teardown)
	form = TeardownForm()

Excerpted from template:
  {% for teardownpart in form.teardownpart %}
    <label for="id_teardownpart.{{ forloop.counter0
}}.part">Part:</
label> {{ teardownpart.part }}
        {% if teardownpart.errors %}
           <span class="error">*** {{
teardownpart.errors|join:",
" }}</span>
        {% endif %}
  {% endfor %}


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