1. Create a class as:

 public class Item: Object
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public override bool Equals(System.Object obj)
        {
            // If parameter is null return false.
            if (obj == null)
            {
                return false;
            }

            // If parameter cannot be cast to Point return false.
            Item i = obj as Item;
            if ((System.Object)i == null)
            {
                return false;
            }
            // Return true if the fields match:
            return ( ID== i.ID);
        }
        public override int GetHashCode()
        {
            return ID;
        }
    }

2.  Get data from wcf ria service:

  MyItems = (from b in this._result
                       select new Item{ Name = b.Name, ID = b.ID }).Distinct();

3. set ItemSource for XamComboEditor:

this.MyCombo.ItemsSource = vm.MyItems;

4. Xaml for XamComboEditor is:

<ig:XamComboEditor x:Name="MyCombo" IsEditable="True"  AllowFiltering="True" AutoComplete="True"
DisplayMemberPath="Name" SelectionChanged="MyCombo_SelectionChanged" />

then run the app and change selected item from XamComboEditor, but event MyCombo_SelectionChanged is never fired.

How to resolve this problem?