How to persist child lists with an entity proxy using the Editor framework?

I have an object "a" that has a number of fields.  One of those fields is a list of object "B".  In My editor, I can create,edit save, etc "A", however even though the list of "B" is proxied, it is never persisted (it gets lost between the submit, and the service).  Are there any examples available of submitting an object graph that includes a child list?  If not, can anyone explain how this is done?

In the examples online, we have a simple graph:

A

|

+--B

And you can create the instance to edit it by doing:

A a = context.create(A.class);

B b = context.create(B.class);

a.setB(b);

context.edit(a);

But how do you edit a List?

A

|

+--List<B>

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