Silverlight Navigation linq problem

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C#

LINQ

Silverlight

C#4.0

Hi,
Basically I have a LINQ query (below) that downloads some XML data and then displays that data in a listbox. (listBox1)

XElement xmlScan = XElement.Parse(e.Result);
                  listBox1.ItemsSource = from channel in xmlScan.Descendants("item")
                                         select new ScanItem
                                         {
                                             title = channel.Element("title").Value,
                                             description = strip2(strip(channel.Element("description").Value)),
                                                                                          };

Then when an item is selected I want to take the title field text from the selected item and use this to navigate to a page with the text attached. I have tried this:

private void ListBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
       {

           NavigationService.Navigate(new Uri("/DetailsPage.xaml?selectedItem=" + MainListBox.SelectedIndex, UriKind.Relative));

       }

However all it does is navigate to DetailsPage and then the item number that was selected no the title field.

Any help is much appreaciated.