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.Refresh();
        }

        private void addFirstPostion(object sender, RoutedEventArgs e)
        {
            Vertex FirstPosition=new Vertex(0,0);
            wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Add(new Feature(FirstPosition));
            wpfMap1.TrackOverlay.Refresh();
        }

        private void addSecondPositon(object sender, RoutedEventArgs e)
        {
            Vertex secondPostion = new Vertex(0, 10);

            PointShape firstPostion = (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() as PointShape);

            LineShape lineshape = new LineShape();
            lineshape.Vertices.Add(new Vertex(firstPostion.X, firstPostion.Y));
            lineshape.Vertices.Add(secondPostion);

            wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Clear();
            wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Add(new Feature(lineshape));
            wpfMap1.TrackOverlay.Refresh();
        }

        private void addThridPosition(object sender, RoutedEventArgs e)
        {
            Vertex thridPostion = new Vertex(10, 10);
            LineShape lineshape = (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() as LineShape);

            PolygonShape polygonShape = new PolygonShape();

            polygonShape.OuterRing.Vertices.Add(lineshape.Vertices[0]);
            polygonShape.OuterRing.Vertices.Add(lineshape.Vertices[1]);
            polygonShape.OuterRing.Vertices.Add(thridPostion);
            polygonShape.OuterRing.Vertices.Add(lineshape.Vertices[0]);

            wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Clear();
            wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Add(new Feature(polygonShape));
            wpfMap1.TrackOverlay.Refresh();
        }

        private void addMorePostion(object sender, RoutedEventArgs e)
        {
            Vertex MyPosition = new Vertex(40, -10);
            PolygonShape Polygon = new PolygonShape();
            Polygon = (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() as PolygonShape);


            List<Vertex> listForInsertingVertex = new List<Vertex>(Polygon.OuterRing.Vertices);
            listForInsertingVertex.RemoveAt(listForInsertingVertex.Count - 1);
            listForInsertingVertex.Insert(0, MyPosition);
            listForInsertingVertex.Add(MyPosition);

            Polygon.OuterRing.Vertices.Clear();

            foreach (Vertex vertex in listForInsertingVertex)
            { Polygon.OuterRing.Vertices.Add(vertex); }

            wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].WellKnownBinary = Polygon.GetWellKnownBinary();
            wpfMap1.TrackOverlay.Refresh();
        }