title: SAPUI5 Data Binding get the value changed in change event
body: <p>I am changing a model on websocket messages. I attached a change event function to it:</p>
  
  <pre><code>oBindingModel.attachChange(function(oEvent){}
  </code></pre>
  
  <p>Now, inside the function, I need to know which value has changed. I searched trough the oEvent Object as well as the returned object from calling this insinde the function. There is a mEventRegistry with an array named change, but I can not find the value in there. Is there any possiblity?</p>
  
  <p><a href="http://i.stack.imgur.com/fqRKX.png" rel="nofollow">the object returned from this</a></p>
  
  <p>Thanks!</p>