title: CurrentItem does not work on iOS but it does work on Android
body: <p><code>CurrentItem</code> does not work on iOS but it does work on Android, I am using xamarin.
  This is my code:</p>
  
  <pre class="lang-cs prettyprint-override"><code>Shell.Current.CurrentItem = new MyPageTest();
  </code></pre>
  
  <p>Launch this exception:</p>
  
  <pre class="lang-none prettyprint-override"><code>system.NullReferenceExcepion
  Object reference not set to an instance of an object.
  </code></pre>
  
  <p>Is there any way to change the CurrentItem?</p>