private void Order_Click(object sender, RoutedEventArgs e)
        {
            Order order = new Order()
            {
                HostingUnitKey  = key,
                GuestRequestKey = req.GuestRequestKey
            };

            try
            {
                bl.AddOrder(order);
                goodReqs.Remove(req);
                list.Items.Remove(this);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }