.NET (Core and Framework)

<ListView Name="lvwTimeCharges" Margin="0,34,0,0">
     <ListView.ItemTemplate>
         <DataTemplate>
             <StackPanel Orientation="Horizontal">
                 <my:uscActivitiesLookup Width="200" Value="{Binding Path='Activity', Mode=TwoWay}" ContextRequested="child_ContextRequested"/>
                 <Label Content="{Binding Path='Activity.sActivityCode'}"/>
             </StackPanel>
         </DataTemplate>
     </ListView.ItemTemplate>
 </ListView>

cEntities Context = new cEntities();
Staff s = null;

Guid gStaff = new Guid("99772C66-B379-4124-839B-3427AE3481C4");
Guid gRate = new Guid("987E3837-F099-481E-BC5C-544BC04361BC");

public MainWindow()
{
    InitializeComponent();

    s = (from staff in Context.Staff where staff.gStaffID == s select staff).First();
    DataContext = s;

    lvwTimeCharges.ItemsSource = (from c in s.Charges where c.Rate.gRateID == gRate select c);

}

private void child_ContextRequested(iWantzContext sender, EventArgs e)
{
    sender.Context = Context;
}

private void button1_Click(object sender, RoutedEventArgs e)
{
    Context.SaveChanges();
}

<ComboBox Name="cmbActivities" SelectionChanged="ComboBox_SelectionChanged" DisplayMemberPath="sActivityDescription"/>

public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(Activity),typeof(uscActivitiesLookup),new PropertyMetadata(ValueChangedCallback));
        
        private static void ValueChangedCallback(DependencyObject obj, DependencyPropertyChangedEventArgs e)
        {
            if ((obj as uscActivitiesLookup).Context != null)
                (obj as uscActivitiesLookup).cmbActivities.SelectedItem = e.NewValue;
        }

        public uscActivitiesLookup()
        {
            InitializeComponent();
        }

        public Activity Value
        {
            get { return (Activity)GetValue(ValueProperty); }
            set {SetValue(ValueProperty,  value);}
        }

        private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (Context != null)
                Value = cmbActivities.SelectedItem as Activity;
        }
        private IEnumerable<TimeRecordingActivity> lookupValues;
        private void PopulateCombo()
        {
            lookupValues = from a in _context.Activities where a.bDeleted == false select a ;
            cmbActivities.ItemsSource = lookupValues;

            if (Value != null)
                cmbActivities.SelectedItem = Value;
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            ContextRequested(this, null);
        }

        #region iWantzContext Members

        public event ContextSharing.ContextRequestedEventHandler ContextRequested;
        
        cEntities _context = null;
        public cEntities Context
        {
            get 
            {
                return _context;
            }
            set
            {
                _context = value;
                PopulateCombo();
            }
        }

        #endregion