Clearing Selection on a bound ListBox in SilverLight 2

Spent way too much time trying to figure out how to unselect an item from a Listbox that had it's ItemsSource bound to a collection. Finally figured out that simply removing the binding and adding it back in with a forced layout update would do the trick.

ListBox lb = sender as ListBox;

var test = lb.ItemsSource;

lb.ItemsSource = null;

lb.ItemsSource = test;

lb.UpdateLayout();