partial void DeleteCustomer(Customer instance);
 partial void UpdateCustomer(Customer instance);
		private void detach_Customers(Customer entity)
		{
			this.SendPropertyChanging();
			entity.CustomerType = null;
		}
 partial void InsertCustomer(Customer instance);
		private void attach_Customers(Customer entity)
		{
			this.SendPropertyChanging();
			entity.CustomerType = this;
		}