public async void OnSelectedItem(object sender, RoutedEventArgs e)
        {
            SelectedItem = GetSelected(sender, e);

            if (SelectedItem != null)
            {
                TicketDtos.Clear();
                foreach (var ticketDto in await _ticketService.GetTicketsAsync(SelectedItem.Id))
                {
                    TicketDtos.Add(ticketDto);
                }

                TicketsList.ItemsSource = TicketDtos;
            }
        }
 public void Assign()
 {
     TicketsSelected = TicketDtos.FirstOrDefault(i => i.IsSelected) != null ? true : false;
     PopupVisible    = true;
 }