Thank you for your interest in RadJumpList.
I tried to reproduce the exception that you described, but I couldn't. There was no exception, but there was no data in the JumpList, because simply setting the DataContext is not enough. You can see how to use the DataContext property here
. To get the items, you need to set the ItemsSource property of the RadJumpList. Then the items should show, but still they won't be grouped until you add a group descriptor. We have examples in our online documentation
. Here is how you can modify your code to display the contacts, grouped by the first letter of their name:
sender, Microsoft.Phone.UserData.ContactsSearchEventArgs e)
//Bind the results to the jump list that displays them in the UI
radJumpList.ItemsSource = e.Results;
> groupByFirstName =
>(contact => contact.DisplayName.Substring(0, 1).ToUpper());
//That's okay, no results
I hope this information helps. Let me know if you still get an exception or if I can assist you further.
the Telerik team