So my tree control is bound to an AS object. This object has
some collections which are shown as branches and nodes in the tree.
If I add an item to the collection, that item will only show in the
tree after I've collapsed and re-expanded its parent node in the
tree. Is there some kind of auto-refresh property I'm missing? One
that will not reset the state of the tree (don't want it to
collapse all my nodes, etc).