title: onBeforeShow of a Nested View Is Never Called
body: <p>I defined a handler for the <a href="https://openui5.hana.ondemand.com/#/api/sap.m.NavContainerChild/events/BeforeShow" rel="nofollow noreferrer"><code>beforeShow</code> event</a> in <code>onInit</code> of the nested view:</p>
  
  <pre><code>this.getView().addEventDelegate({
      onBeforeShow: jQuery.proxy(function(oEvent) {
          this.onBeforeShow(oEvent);
      }, this)
  });
  </code></pre>
  
  <p>and then:</p>
  
  <pre><code>onBeforeShow: function(){
      alert("Hello!");
  }
  </code></pre>
  
  <p>But this handler is never called.</p>
  
  <p>I need an event to be triggered in the controller of the nested view every time the nested view is displayed. How do I do that?</p>