title: Windows Phone open ListPicker in Fullscreen mode on AppBarButton click
body: <p>I want to open a ListPicker in Fullscreen mode on ApplicationBarButton click. The ListPicker should be opened as new popup and should not be visible in the page.</p>
  
  <p>This was my try:</p>
  
  <pre><code>    private void OnAppBarButtonClick(object sender, EventArgs e)
      {
          ListPicker listPicker = new ListPicker();
          listPicker.ExpansionMode = ExpansionMode.FullScreenOnly;
          this.ContentPanel.Children.Add(listPicker);
  
          ListPickerItem item1 = new ListPickerItem() { Content = "Item1" };
          ListPickerItem item2 = new ListPickerItem() { Content = "Item2" };
          ListPickerItem item3 = new ListPickerItem() { Content = "Item3" };
          listPicker.Items.Add(item1);
          listPicker.Items.Add(item2);
          listPicker.Items.Add(item3);
  
          listPicker.Open();
      }
  </code></pre>