title: How can I trigger the loading animation of a WinJS ListView
body: <p>is there a way to trigger the loading animation of a ListView manually?</p>
  
  <p>I load some data on start up from a web service and would like to display a busy indecator.</p>
  
  <pre><code> function searchData(url) {
  
          var promise = DataService.getData(query);
  
          promise.done(function (result) {
              console.dir(result);
              var bindingList = new WinJS.Binding.List(result);
  
              sectionListView.winControl.itemDataSource = bindingList.dataSource;
  
          });
      }
  </code></pre>
  
  <p>this is what I do in app.onactivated</p>
  
  <pre><code>promise = WinJS.UI.processAll();
          promise.done(function () {
              searchData(query);
          });
          args.setPromise(promise);
  </code></pre>
  
  <p>I read something that ListView should display busy animation while waiting for a promise...
  Is this true?
  Or is this something I have to do manually... display and hide a div whenever needed?</p>
  
  <p>Thanks for any help...</p>