private void btnPause_Click(object sender, System.EventArgs e)
        {
            (wpfMap1.TrackOverlay as MyInteractiveOverLay).MouseDoubleClick();

            if (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() is LineShape)
            {
                LineShape lineShape = wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() as LineShape;
                lineShape.Vertices.RemoveAt(lineShape.Vertices.Count - 1);
                wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].WellKnownBinary = lineShape.GetWellKnownBinary();
            }
            else if (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() is PolygonShape)
            {
                PolygonShape polygonShape = wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() as PolygonShape;
                polygonShape.OuterRing.Vertices.RemoveAt(polygonShape.OuterRing.Vertices.Count - 2);
                wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].WellKnownBinary = polygonShape.GetWellKnownBinary();
            }

            wpfMap1.TrackOverlay.TrackMode = TrackMode.None;
            wpfMap1.Refresh();
        }

        private void btnResume_Click(object sender, System.EventArgs e)
        {
            System.Collections.ObjectModel.Collection<Vertex> vertexes = new System.Collections.ObjectModel.Collection<Vertex>();

            if (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() is LineShape)
            {
                wpfMap1.TrackOverlay.TrackMode = TrackMode.Line;
                vertexes = (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() as LineShape).Vertices;

                wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.RemoveAt(0);
            }
            else if (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() is PolygonShape)
            {
                wpfMap1.TrackOverlay.TrackMode = TrackMode.Polygon;
                vertexes = (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() as PolygonShape).OuterRing.Vertices;
                vertexes.RemoveAt(vertexes.Count - 1);

                wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.RemoveAt(0);
            }

            if (vertexes.Count > 0)
            {
                for (int i = 0; i < vertexes.Count; i++)
                {
                    (wpfMap1.TrackOverlay as MyInteractiveOverLay).MouseDown(new InteractionArguments() { WorldX = vertexes[i].X, WorldY = vertexes[i].Y });
                }

                (wpfMap1.TrackOverlay as MyInteractiveOverLay).MouseDown(new InteractionArguments() { WorldX = vertexes[vertexes.Count - 1].X, WorldY = vertexes[vertexes.Count - 1].Y });
            }
        }

        private void btnDropLastPoint_Click(object sender, System.EventArgs e)
        {
            System.Collections.ObjectModel.Collection<Vertex> vertexes = new System.Collections.ObjectModel.Collection<Vertex>();
            Feature newFeature;

            if (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() is LineShape)
            {
                vertexes = (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() as LineShape).Vertices;

                vertexes.RemoveAt(vertexes.Count - 1);

                newFeature = new Feature(new LineShape(vertexes));

                wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.RemoveAt(0);
                wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Add(newFeature);
            }
            else if (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() is PolygonShape)
            {
                wpfMap1.TrackOverlay.TrackMode = TrackMode.Polygon;
                vertexes = (wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures[0].GetShape() as PolygonShape).OuterRing.Vertices;
                vertexes.RemoveAt(vertexes.Count - 2);

                if (vertexes.Count < 4)
                {
                    return;
                }

                newFeature = new Feature(new PolygonShape(new RingShape(vertexes)));

                wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.RemoveAt(0);
                wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Add(newFeature);
            }

            wpfMap1.Refresh();
        }