Problem with Include

      //Create 1 EntityManager called mgr1. Prime it with 1 customer and 1 order
      var mgr1 = new NorthwindIBEntities();
      var newCust = CreateTestCustomer(mgr1);
      var newOrder = CreateTestOrder(mgr1);
      newCust.OrderSummaries.Add(newOrder);
      mgr1.SaveChanges();

      //Create another EntityManager called mgr2. Query the newly created customer
      var mgr2 = new NorthwindIBEntities();
      var newCust2 = mgr2.Customers.Where(c => c.Id == newCust.Id).Include(c => c.OrderSummaries).FirstOrNullEntity();
      var newOrder2 = newCust2.OrderSummaries.FirstOrDefault();

      //Delete the order
      newOrder2.EntityAspect.Delete();
      mgr2.SaveChanges();

      //Refresh mgr1 by calling RefetchEntities
      mgr1.RefetchEntities(newCust.OrderSummaries, MergeStrategy.OverwriteChanges);

      //Now verify that order has indeed been deleted
      Assert.IsTrue(newOrder.EntityAspect.EntityState.IsDetached());
      Assert.IsTrue(newCust2.OrderSummaries.Count == 0);