title: How can I fire a Traits static event notification on an array change?
body: <p>I'm trying to setup a static notification if a value in an array gets changed, but so far I've had no success...
  I found an earlier question about notifications on changes to a List that used the _items_changed wording that looked like it might work, but alas, it didn't :(</p>
  
  <p>Anyone have a suggestion how I should go about setting up a static notification handler whenever an element of an array gets changed?</p>
  
  <p>BTW, I'm using Enthought Canopy V1.4.1.1975</p>