title: Trigger a event on Zoom change SAPUI5
body: <p>I want an event to be triggered when zoom of the map changes. I am using
  sapui5 google maps.  In my view.xml i bound the map as following</p>
  <pre><code>&lt;gmaps:Map id=&quot;map1&quot; class=&quot;googleMap&quot; height=&quot;600px&quot; width=&quot;100%&quot; zoom=&quot;4&quot; lat=&quot;100&quot; lng=100&quot; markers=&quot;{/co}&quot; ready=&quot;onMapReady&quot;  zoomControl = 'true' 
  zoom_changed  = &quot;renderNewMap&quot;&gt;
  </code></pre>
  <p>But it doesn't trigger the event.</p>