private void WpfMap_Loaded(object sender, RoutedEventArgs e)
        {
            wpfMap1.MapUnit = GeographyUnit.DecimalDegree;
            wpfMap1.CurrentExtent = new RectangleShape(-133.2515625, 89.2484375, 126.9046875, -88.290625);

            wpfMap1.TrackOverlay.TrackShapeLayer.Open();
            wpfMap1.TrackOverlay.TrackShapeLayer.Columns.Add(new FeatureSourceColumn("Area"));
            wpfMap1.TrackOverlay.TrackShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = TextStyles.CreateSimpleTextStyle("Area", "Arial", 12, DrawingFontStyles.Regular, GeoColor.StandardColors.Black, GeoColor.FromArgb(100, GeoColor.SimpleColors.Green), 2, 0, -8);
            wpfMap1.TrackOverlay.TrackShapeLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            wpfMap1.TrackOverlay.TrackEnded += new System.EventHandler<TrackEndedTrackInteractiveOverlayEventArgs>(TrackOverlay_TrackEnded);


            wpfMap1.EditOverlay.EditShapesLayer.Open();
            wpfMap1.EditOverlay.EditShapesLayer.Columns.Add(new FeatureSourceColumn("Area"));
            wpfMap1.EditOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = TextStyles.CreateSimpleTextStyle("Area", "Arial", 12, DrawingFontStyles.Regular, GeoColor.StandardColors.Black, GeoColor.FromArgb(100, GeoColor.SimpleColors.Green), 2, 0, -8);
            wpfMap1.EditOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            wpfMap1.EditOverlay.FeatureEdited += new System.EventHandler<FeatureEditedEditInteractiveOverlayEventArgs>(EditOverlay_FeatureEdited);

            wpfMap1.Refresh();
        }

        void EditOverlay_FeatureEdited(object sender, FeatureEditedEditInteractiveOverlayEventArgs e)
        {
            PolygonShape polygonShape = new PolygonShape(wpfMap1.EditOverlay.EditShapesLayer.InternalFeatures[0].GetWellKnownBinary());
            if (polygonShape != null)
            { wpfMap1.EditOverlay.EditShapesLayer.InternalFeatures[0].ColumnValues["Area"] = "Area is:" + polygonShape.GetArea(GeographyUnit.DecimalDegree, AreaUnit.SquareKilometers).ToString(); }
        }

        void TrackOverlay_TrackEnded(object sender, TrackEndedTrackInteractiveOverlayEventArgs e)
        {
            PolygonShape polygonShape = new PolygonShape(wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetWellKnownBinary());
            if (polygonShape != null)
            { wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].ColumnValues["Area"] = "Area is:" + polygonShape.GetArea(GeographyUnit.DecimalDegree, AreaUnit.SquareKilometers).ToString(); }
        }