I'm trying to figure out how to remove an element from a reactive form.

Here's a plunker of a small example: <http://plnkr.co/edit/HyhMDoMtek02CyKpZ7Wt?p=preview>

When I hit the `X` button, the form object is updated but the form UI still has the item on there.

How do I get the form to update itself on the remove?