HELP ON Silverlight Toolbox for phone

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C#

XAML

Silverlight

I have intermediate experience in C# and my company (am new there) is trying
to go into Mobile, so I am to figure out how to make existing apps work on WP7

I have used some tools in the Silverlight Toolkit from Codeplex, but I discovered that the forum
at codeplex is not active for a while now, so I decide to come to you guy at codeproject.

first I will like to know if I can still use Silverlight Toolkit - am skeptic on the support maybe it'll becontinued or end up like Silverlight Toolbox

Second my longlistSelector Control gives a null reference when I press the back button but changing the control to a ListBox works fine.

Please tell me what I am doing wrong and also if I have alternative to Silverlight Toolbox or if I really don't need it. I know of Coding4Fun @codeplex too. Thank you.

XAML:

<toolkit:longlistselector x:name=""areaList"" removed=""Transparent"" isflatlist=""True"<br" mode="hold" xmlns:x="#unknown" xmlns:toolkit="#unknown" />                                       ItemTemplate="{StaticResource itemTemplate}" ListHeaderTemplate="{StaticResource listHeader}" ListFooterTemplate="{StaticResource listFooter}" SelectionChanged="List_SelectionChanged" />

>


C#:

<pre lang="cs">private void List_SelectionChanged(object sender, SelectionChangedEventArgs e)
       {
           if (areaList.SelectedItem == null)
               return;
           var listbox = (ListBox)sender;
           var entry = (AreaModel)listbox.SelectedItem;
           var uri = &quot;/Territory.xaml?id=&quot; + entry.AREA_KEY;
           NavigationService.Navigate(new Uri(uri, UriKind.Relative));
           areaList.SelectedItem = null;
       }

protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
       {
           string selectedIndex = "";
           if (NavigationContext.QueryString.TryGetValue("id", out selectedIndex))
           {
               int index = int.Parse(selectedIndex);
               string strSelect = "SELECT AREA_KEY,AREA_NAME FROM AREA WHERE REGION_SK = " + index.ToString();
               _area = (Application.Current as App).db.SelectList<AreaModel>(strSelect);
               //PageTitle.Text +=
               areaList.ItemsSource = _area;
           }

HERE IS THE EXCEPTION DETAIL :

System.NullReferenceException was unhandled
  Message=NullReferenceException
  StackTrace:
       at Microsoft.Phone.Controls.LongListSelector.Balance()
       at Microsoft.Phone.Controls.LongListSelector.LongListSelector_LayoutUpdated(Object sender, EventArgs e)
       at System.Windows.FrameworkElement.OnLayoutUpdated(Object sender, EventArgs e)
       at MS.Internal.JoltHelper.RaiseEvent(IntPtr target, UInt32 eventId, IntPtr coreEventArgs, UInt32 eventArgsTypeIndex)