title: onSupportNavigateUp() not called
body: <p>I'm developing an app with ActionBars which supports Gingerbread and up. So basically I'm using the support library and extending </p>
  
  <blockquote>
    <p>ActionBarActivity</p>
  </blockquote>
  
  <p>for all my activities. Everything works well except for the </p>
  
  <blockquote>
    <p><a href="http://developer.android.com/reference/android/support/v7/app/ActionBarActivity.html#onSupportNavigateUp%28%29" rel="noreferrer">onSupportNavigateUp()</a></p>
  </blockquote>
  
  <p>method. It just does not get called as stated in the documentation. </p>
  
  <blockquote>
    <p>This method is called whenever the user chooses to navigate Up within
    your application's activity hierarchy from the action bar.</p>
  </blockquote>
  
  <p>This is quite easy but I haven't been able to figure out why it does not work as expected nor Googling helped. Is this a bug? or am I missing something?</p>