title: XCode Interface builder missing view hierarchy
body: <p>I've just installed Xcode 6.4 on a new macbook and started a new project for some reason i can't find the view hierarchy usually present on the left hand side where i can see which views sit in which....</p>
  
  <p>Hopefully this explains what I mean:</p>
  
  <pre><code>-view
  ---view
  ----label
  ----button
  ---view
  ----label
  </code></pre>