title: View Swapping using NSTreeView
body: <p>I've got a custom NSView that I've made up. Basically, for each item in a tree view that I select, I want to swap the view out with another one.</p>
  
  <p>My question is, should I be using something like NSArrayController for this? If so, how do you hook up a custom NSView to use NSArrayController <em>and</em> swap between views based on selections in an NSTreeView?</p>