private void OnPhoneBillSelected(object sender, ItemClickEventArgs e)
        {
            ObservablePhoneBill phoneBill = (ObservablePhoneBill)e.ClickedItem;
            var nav = WindowWrapper.Current().NavigationServices.FirstOrDefault();

            nav.Navigate(typeof(Views.DetailPage), phoneBill.BillNo);
        }
        public void OnNavigationStarting(WebView sender, WebViewNavigationStartingEventArgs args)
        {
            Views.Busy.SetBusy(true, "Wait Madi...");
            ObservablePhoneBill pb = PBAApplication.getInstance().GetObservablePhoneBill(BillNo);

            if (pb != null)
            {
                sender.AddWebAllowedObject("phone_bill", pb);
            }
        }