title: Using UI hash key in an events hash
body: <p>I am using marionette version 1.2.3 and backbone version 1.1.0</p>
  
  <p>Here is my UI and events hash:</p>
  
  <pre><code>ui:{
      title : '#modelTypeTitle'
  },
  events:
  {
      'change @ui.title' : 'validateTitle'
  },
  </code></pre>
  
  <p>This seems to match what the documentation says:
  "You can also use the ui hash values from within events and trigger keys using the '@ui.elementName'"</p>
  
  <p>To clarify I want to know why what I am trying above does not work.  but the following works fine:</p>
  
  <pre><code>events:
  {
      'change #modelTypeTitle' : 'validateTitle'
  },
  </code></pre>