InMemoryFeatureLayer inm = new InMemoryFeatureLayer();

        public LoadAShapeFileFeatureLayer()
        {
            InitializeComponent();
        }

        private void WpfMap_Loaded(object sender, RoutedEventArgs e)
        {
            wpfMap1.MapUnit = GeographyUnit.DecimalDegree;

            wpfMap1.CurrentExtent = new RectangleShape(-180, 90, 180, -90);
            ShapeFileFeatureLayer layer = new ShapeFileFeatureLayer("../../sampledata/data/usstates.shp");
            layer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.Country1;
            layer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            inm.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.Antarctica1;
            inm.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            LayerOverlay inmOverlay = new LayerOverlay();
            inmOverlay.Layers.Add(inm);

            LayerOverlay overlay = new LayerOverlay();
            overlay.Layers.Add(layer);
            //add your layers here
            //overlay.Layers.Add(layer1);
            //overlay.Layers.Add(layer2);
            //overlay.Layers.Add(layer3);
            //overlay.Layers.Add(layer4);
            //overlay.Layers.Add(layer5);

            wpfMap1.MapClick += new System.EventHandler<MapClickWpfMapEventArgs>(wpfMap1_MapClick);
            wpfMap1.Overlays.Add("overlay",overlay);
            wpfMap1.Overlays.Add("inmOverlay", inmOverlay);
            wpfMap1.Refresh();
        }

        void wpfMap1_MapClick(object sender, MapClickWpfMapEventArgs e)
        {
            inm.Open();
            inm.Clear();

            foreach (FeatureLayer item in ((LayerOverlay)wpfMap1.Overlays["overlay"]).Layers)
            {
                item.Open();
                Collection<Feature> features = item.QueryTools.GetFeaturesContaining(e.WorldLocation, ReturningColumnsType.AllColumns);
                foreach (var feature in features)
                {
                    inm.InternalFeatures.Add(feature);
                }
            }

            wpfMap1.Refresh(wpfMap1.Overlays["inmOverlay"]);
        }