private void OrdersList_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
DateTime orderDate = (DateTime)OrdersList.SelectedItem;
var selectedOrder = zzaEntities.Orders.Include("OrderItems").
Where(o => o.OrderDate == orderDate &&
o.CustomerId == (Guid)CustomerIdLabel.Content).FirstOrDefault();
viewModel.OrderItems = selectedOrder.OrderItems.ToList();
DataContext = viewModel;
OrderItemsDataGrid.GetBindingExpression(DataGrid.ItemsSourceProperty).UpdateTarget();
}
public void RefreshOrderItemsDataGrid()
{
OrderItemsDataGrid?.GetBindingExpression(ItemsControl.ItemsSourceProperty)?.UpdateTarget();
OrderItemsDataGrid?.Items.Refresh();
}