title: When does a model get updated after the model data has changed?
body: <p>There is a method named updateBindings(true?) in openui5. But I'm not sure when I have to invoke it. Sometimes, setting the modified data to a model causes view changes, which indicates the underlying model data actually gets changed. Sometimes it won't work.  </p>
  
  <p>The first example demonstrates that the model doesn't get changed without updateBindings(true).
  <a href="http://jsbin.com/hulavutoha/edit?html,css,output" rel="nofollow">http://jsbin.com/hulavutoha/edit?html,css,output</a></p>
  
  <p>The second example derives from the first one. But the model gets updated even without updateBindings(true).
  <a href="http://jsbin.com/lepuladivu/edit?html,css,output" rel="nofollow">http://jsbin.com/lepuladivu/edit?html,css,output</a></p>
  
  <p>So, what's the difference between the two examples? When do I need to invoke updateBindings(true) on a model so that it will get updated? What's the intent of the parameter <strong>true</strong> passed to updateBindings()?</p>