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

        private void button_Click(object sender, RoutedEventArgs e)
        {
            Button button = sender as Button;
            if (button != null)
            {
                switch (button.Name)
                {
                    case "btnTrackLine":
                        wpfMap1.TrackOverlay.TrackMode = TrackMode.Line;
                        break;
                    case "btnTrackEdit":
                        wpfMap1.TrackOverlay.TrackMode = TrackMode.None;
                        foreach (Feature feature in wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures)
                        {
                            wpfMap1.EditOverlay.EditShapesLayer.InternalFeatures.Add(feature);
                        }
                        wpfMap1.TrackOverlay.TrackShapeLayer.InternalFeatures.Clear();
                        wpfMap1.EditOverlay.CalculateAllControlPoints();
                        EditPointControl();
                        wpfMap1.EditOverlay.FeatureEdited += new System.EventHandler<FeatureEditedEditInteractiveOverlayEventArgs>(EditOverlay_FeatureEdited);
                        wpfMap1.Refresh(new Overlay[] { wpfMap1.EditOverlay, wpfMap1.TrackOverlay });
                        break;
                    case "btnTrackDelete":
                        int lastIndex = wpfMap1.EditOverlay.EditShapesLayer.InternalFeatures.Count - 1;
                        if (lastIndex >= 0)
                        {
                            wpfMap1.EditOverlay.EditShapesLayer.InternalFeatures.RemoveAt(lastIndex);
                            wpfMap1.EditOverlay.CalculateAllControlPoints();
                            EditPointControl();
                        }
                        wpfMap1.Refresh(wpfMap1.EditOverlay);
                        break;
                    default:
                        wpfMap1.TrackOverlay.TrackMode = TrackMode.None;
                        break;
                }
            }
        }

        void EditOverlay_FeatureEdited(object sender, FeatureEditedEditInteractiveOverlayEventArgs e)
        {
            EditPointControl();
        }

        private void EditPointControl()
        {
            ControlPoints.Clear();
            GeoCollection<Feature> editFeatures = wpfMap1.EditOverlay.ExistingControlPointsLayer.InternalFeatures;
            foreach (Feature shapeFeature in wpfMap1.EditOverlay.EditShapesLayer.InternalFeatures)
            {
                ExEditInteractiveOverlay exEditOverLay = new ExEditInteractiveOverlay();
                IEnumerable<Feature> pointFeatures = exEditOverLay.GetPointShapeFeaturesFormFeature(shapeFeature);
                GetEditPoint(editFeatures, pointFeatures);
            }
            editFeatures.Clear();
            foreach (Feature f in ControlPoints)
            {
                editFeatures.Add(f);
            }
        }

        private void GetEditPoint(GeoCollection<Feature> editFeatures, IEnumerable<Feature> pointFeatures)
        {
            int count = 0;
            foreach (Feature feature in pointFeatures)
            {
                if (count == 2) break;
                else
                {
                    foreach (Feature f in editFeatures)
                    {
                        if (f.GetWellKnownText() == feature.GetWellKnownText())
                        {
                            ControlPoints.Add(f);
                            count++;
                        }
                    }
                }
            }
        }