ArcGISWindowsPhoneSDK.MainPage.ListBoxCategory_MouseLeftButtonUp C# (CSharp) Метод

        private void ListBoxCategory_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            ESRI.ArcGIS.Client.IdentityManager.Current.ChallengeMethod = null;
            foreach (IdentityManager.Credential crd in ESRI.ArcGIS.Client.IdentityManager.Current.Credentials)
                ESRI.ArcGIS.Client.IdentityManager.Current.RemoveCredential(crd);

            (ApplicationBar.Buttons[2] as IApplicationBarIconButton).IsEnabled = true;

            // Capture selected item data
            _selectedItem = (sender as ListBox).SelectedItem;
            if (_selectedItem != null)
            {
                ItemViewModel ivm = _selectedItem as ItemViewModel;
                _xaml = ivm.XAML;
                // Start page transition animation
                NavigationService.Navigate(new Uri(_xaml, UriKind.Relative));
                FrameworkElement root = Application.Current.RootVisual as FrameworkElement;
                root.DataContext = _selectedItem;
            }
            (sender as ListBox).SelectedItem = null;
        }