title: WP8 Can't show listbox item after using hardware back button
body: <p>I have two <code>ListBox</code> items: one for show all items and another <code>ListBox</code> for show only selected item and now when I am using hardware back button second <code>ListBox</code> item is not showing?</p>
  
  <p>What do I need to do to allow the <code>ListBox</code> to be selectable/clickable upon return?</p>
  
  <pre><code>Height="72" TextWrapping="Wrap" Name="txtMSG" Text="TextBox" Width="456"/&gt;
  
          &lt;!--ContentPanel - place additional content here--&gt;
          &lt;Grid x:Name="ContentPanel" Grid.Row="2" Margin="15,10,15,0"&gt;
              &lt;ListBox Name="list_location" Tap="list_location_Tap" Foreground="Black"&gt;
                  &lt;ListBox.ItemTemplate&gt;
                      &lt;DataTemplate&gt;
                          &lt;TextBlock x:Name="item_name" Text="{Binding description, Mode=OneWay}" Padding="5,15,5,15" TextWrapping="Wrap" FontSize="{StaticResource PhoneFontSizeLarge}"/&gt;
                      &lt;/DataTemplate&gt;
                  &lt;/ListBox.ItemTemplate&gt;
  
              &lt;/ListBox&gt;
  
              &lt;ListBox Name="list_locationAdd"  Foreground="Black" Visibility="Collapsed"&gt;
                  &lt;ListBox.ItemTemplate&gt;
                      &lt;DataTemplate&gt;
                          &lt;TextBlock x:Name="item_name" Text="{Binding description, Mode=OneWay}" Padding="5,15,5,15" TextWrapping="Wrap" FontSize="{StaticResource PhoneFontSizeLarge}"/&gt;
                      &lt;/DataTemplate&gt;
                  &lt;/ListBox.ItemTemplate&gt;
              &lt;/ListBox&gt;
  
  list_locationAdd.Visibility = Visibility.Visible;
  list_location.Visibility = Visibility.Collapsed;
  
  if (!list_locationAdd.Items.Contains(list_location.SelectedItem))
  {
      list_locationAdd.Items.Add(list_location.SelectedItem);
  
  }
  </code></pre>