ArcGISWindowsPhoneSDK.GeometryJSON.TabControl_SelectionChanged C# (CSharp) Метод

        private void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (_myFromJsonGraphicsLayer != null || _myToJsonGraphicsLayer != null)
            {
                ClearGraphicsLayers();
                OutJsonTextBox.Text = "";
            }
            else
                return;

            if ((((sender as Pivot).SelectedItem as PivotItem).Header as string) == "From JSON")
                _myDrawObject.IsEnabled = false;
        }