Specifying the Selected Items in a ListBox with Multiple Selection Enabled

The project obviously isn't finished yet, and some parts of it link to other projects in the solution, but here are the primary relative pieces:

<TextBox x:Name="txtEditAddStore"/>
<Button x:Name="btnEditAddStore" Content="Add Store"/>
<ListBox x:Name="lstEditStores" SelectionMode="Multiple" DisplayMemberPath="Name" ItemsSource="{Binding Stores}">

Public Class Store
        Public Property Id() As Byte
        Public Property Name() As String
        Public Property Address() As String
        Public Property Website() As String
        Public Sub New()
        End Sub
        Public Sub New(i As Byte, n As String, addr As String, web As String)
                Me.Id = i
                Me.Name = n
                Me.Address = addr
                Me.Website = web
        End Sub
End Class

Public Class ObservableStores
        Public Property Stores() As ObservableCollection(Of Store)

        Public Sub New()
                Me.Stores = New ObservableCollection(Of Store)(CType(Application.Current, App).Stores.OrderBy(Function(s) s.Name))
                AddHandler Me.Stores.CollectionChanged, AddressOf Me.Stores_CollectionChanged
        End Sub

        Private Sub Stores_CollectionChanged(sender As Object, e As System.Collections.Specialized.NotifyCollectionChangedEventArgs)
        End Sub
End Class

And I use the following line to initialize the ListBox:

Me.lstEditStores.DataContext = New ObservableStores()

And I use the following code to add items (which is when the error occurs):

Private Sub btnEditAddStore_Click(sender As Object, e As RoutedEventArgs) Handles btnEditAddStore.Click
        CType(Me.lstEditStores.DataContext, ObservableStores).Stores.Add(CType(Application.Current, App).GetStoreById(id))
End Sub

If you need more detail about any of the code (or I forgot something), let me know, I will be happy to give it to you, or if you can tell me where to do it, I am even willing to upload the entire project and related projects (but that seemed rather unnecessary for just this problem). Thanks.

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Nathan Sokalski njsokalski@hotmail.com http://www.nathansokalski.com/