private async void BtnAddOrder_Click(object sender, RoutedEventArgs e)
        {
            var addOrderWindow = new AddOrderWindow(_makeOrderViewModel)
            {
                Owner = this
            };
            var result = addOrderWindow.ShowDialog();

            if (result.HasValue && result.Value)
            {
                var order = new Order
                {
                    SessionId    = _makeOrderViewModel.SelectedSession.Id,
                    TicketsCount = _makeOrderViewModel.TicketsCount == 0 ? 1 : _makeOrderViewModel.TicketsCount,
                    Sold         = DateTime.Now
                };

                var progress = new ProgressWindow("Оформление заказа...")
                {
                    Owner = this
                };
                progress.Show();
                BtnAddOrder.IsEnabled = false;
                await ApiClient.AddOrderAsync(order);

                BtnAddOrder.IsEnabled = true;
                progress.Close();

                order.Session = _makeOrderViewModel.SelectedSession;

                await UpdateOrders();
            }

            _makeOrderViewModel.Reset();
        }