private void ImportFromKmlFile(NavigationEventArgs e)
        {
            KmlDocument      kd             = e.Parameter as KmlDocument;
            List <Folder>    folderNodes    = kd.GetFolders();
            List <Placemark> placemarkNodes = kd.GetPlacemarks(folderNodes[0]);

            foreach (var placemarkNode in placemarkNodes)
            {
                try
                {
                    if (!KmlDocument.IsRoutePlacemark(placemarkNode))
                    {
                        Point p = kd.GetPoint(placemarkNode);
                        _appState.Points.Add(p);
                    }
                }
                catch (Exception ex)
                {
                    Debug.WriteLine(ex.StackTrace);
                }
            }
        }