async void SetUserTrackCurrentLocation(double latitude, double longitude)
        {
            try
            {
                CloseMessage();
                //  trvMap.Children.Clear();
                // Get the cancellation token.
                _cts  = new CancellationTokenSource();
                token = _cts.Token;
                // Get the location.


                Location location = new Location(latitude, longitude);

                //// Now set the zoom level of the map based on the accuracy of our location data.
                //// Default to IP level accuracy. We only show the region at this level - No icon is displayed.
                //double zoomLevel = 13.0f;

                //// Add the 10m icon and zoom closer.
                //if (trvMap.Children.Count == 0) {
                //    trvMap.Children.Add(_locationIcon10m);
                //}

                //MapLayer.SetPosition(_locationIcon10m, location);
                //zoomLevel = 15.0f;

                //// Set the map to the given location and zoom level.
                //trvMap.SetView(location, zoomLevel);

                // Now set the zoom level of the map based on the accuracy of our location data.
                // Default to IP level accuracy. We only show the region at this level - No icon is displayed.
                double          zoomLevel            = 17.0f;
                LocationIcon10m _locationUserIcon10m = new LocationIcon10m();
                Callout         callout = new Callout();

                callout.Text = "Tracker's Location";
                callout.Lon  = "Lon (λ): " + location.Longitude.ToString().Substring(0, 7);
                callout.Lat  = "Lat (φ): " + location.Latitude.ToString().Substring(0, 7);
                _locationUserIcon10m.DataContext = callout;

                foreach (var children in trvMap.Children)
                {
                    if (children.GetType().Name == "LocationIcon10m")
                    {
                        trvMap.Children.Remove(children);
                        break;
                    }
                }
                // Add the 10m icon and zoom closer.
                trvMap.Children.Add(_locationUserIcon10m);
                MapLayer.SetPosition(_locationUserIcon10m, location);
                // Set the map to the given location and zoom level.
                trvMap.SetView(location, zoomLevel);
            }
            catch { }
        }
        public TrackMap()
        {
            this.InitializeComponent();
            _geolocator       = new Geolocator();
            _locationIcon10m  = new LocationIcon10m();
            _locationIcon100m = new LocationIcon100m();
            if (myTimer != null)
            {
                myTimer.Stop();
            }
            if (trackerTimer != null)
            {
                trackerTimer.Stop();
            }
            MapCurrentLocation();

            AddDeactivateAccountMenu();
        }