title: How to do something after GridLayout is rendered?
body: <p>I am using a listView control in my Windows8 JavaScript app and I am rendering the items on the page using some code which looks like:</p>
  
  <pre><code>            listView.layout = new ui.GridLayout({
                  groupHeaderPosition: "top",
                  groupInfo: this.groupInfo,
                  itemInfo: this.computeItemSize
              });
  </code></pre>
  
  <p>Now I want to do some action <em>after</em> these items are rendered on the page. Any idea where I can set a callback for this?</p>