Entity Framework - Sorting Relationproperties

[Nicolai Schrade]

Hi, my question is, how do I sort related items of an entity. In an invoice editing window, I have one ComboBox displaying all customers: XAML:

<UserControl.Resources>
    <CollectionViewSource x:Key="cvsCustomers" 
                          d:DesignSource="{d:DesignInstance local:Customer, CreateList=True}" />

...

</UserControl.Resources>

<ComboBox ItemsSource="{Binding Source={StaticResource cvsCustomers}}" .../>

Code-behind:

Dim cvsCustomers As System.Windows.Data.CollectionViewSource
cvsCustomers = CType(Me.FindResource("cvsCustomers"), System.Windows.Data.CollectionViewSource)

Dim qryCustomers = _
From c In myEntities.Customers _
Order By c.CustomerCode
Select c
cvsCustomers.Source = qryCustomers

Now I have a 2nd ComboBox displaying all contact persons of the selected customer. This works fine, but the entries in this second ComboBox are unsorted / sorted by ID. XAML:

<ComboBox ItemsSource="{Binding Path=myInvoice.Customer.Contacts}" .../>

; How do I get the list on the 2nd ComboBox sorted? King regards, and thanks in advance for tips/suggestions, Nico