void OnItemSelected(object sender, SelectedItemChangedEventArgs e)
        {
            StoreMobile.TicketObject ticket = (StoreMobile.TicketObject)e.SelectedItem;
            //ticket.Init(ticket);
            var todoPage = new TicketDetailListPage(ticket.Id);

            todoPage.BindingContext = ticket;

            Navigation.PushAsync(todoPage);
        }
        void OnAddItemClicked(object sender, EventArgs e)
        {
            var ticket = new TicketObject();
            //var OnlineProduct = new OnlineProduct () {
            //	Id = Guid.NewGuid ().ToString ()
            //};
            var todoPage = new TicketDetailListPage(0);

            todoPage.BindingContext = ticket;
            Navigation.PushAsync(todoPage);
        }
        void OnAddItemClicked(object sender, EventArgs e)
        {
            var detail = new TicketDetailListPage(ticketId);

            Navigation.PushAsync(detail);
        }