private async void OnBtnSendSingle(object sender, RoutedEventArgs e)
        {
            try
            {
                await MessagingService.Instance.SendMessageToSeat(GetMessage(), SelectedPassenger.Id);

                AlertMessageSend();
            }
            catch (Exception a)
            {
                AlertMessageSendFailed();
            }
            SelectedPassenger = null;
            RecalculateState();
        }
 private void OnBtnClearSelected(object sender, RoutedEventArgs e)
 {
     SelectedPassenger = null;
     RecalculateState();
 }
 private void ClearScreen()
 {
     TextBoxMessage.Text    = "";
     this.SelectedPassenger = null;
     this.RecalculateState();
 }
 private void ListViewPassengers_ItemClick(object sender, ItemClickEventArgs e)
 {
     this.SelectedPassenger = (ViewModels.Passenger)e.ClickedItem;
     RecalculateState();
 }