private void UseRotationProjectionForAFeatureLayer_Load(object sender, EventArgs e)
        {
            winformsMap1.MapUnit = GeographyUnit.Meter;
            winformsMap1.BackgroundOverlay.BackgroundBrush = new GeoSolidBrush(GeoColor.GeographicColors.ShallowOcean);

            ShapeFileFeatureLayer worldLayer = new ShapeFileFeatureLayer(@"..\..\SampleData\Data\Countries02.shp");
            worldLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.Sand1;
            worldLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            rotateProjection = new RotationProjection();
            worldLayer.FeatureSource.Projection = rotateProjection;

            LayerOverlay worldOverlay = new LayerOverlay();
            worldOverlay.Layers.Add("WorldLayer", worldLayer);
            winformsMap1.Overlays.Add("WorldOverlay", worldOverlay);
            winformsMap1.ZoomLevelSnapping = ZoomLevelSnappingMode.None;
            winformsMap1.CurrentExtent = rotateProjection.GetUpdatedExtent(new RectangleShape(-180.0, 83.0, 180.0, -90.0));
            winformsMap1.MapClick += new EventHandler<MapClickWinformsMapEventArgs>(winformsMap1_MapClick);
            winformsMap1.Refresh();
        }

        void winformsMap1_MapClick(object sender, MapClickWinformsMapEventArgs e)
        {
            LayerOverlay worldOverlay = winformsMap1.Overlays["WorldOverlay"] as LayerOverlay;
            ShapeFileFeatureLayer worldLayer = worldOverlay.Layers["WorldLayer"] as ShapeFileFeatureLayer;
            worldLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = AreaStyles.Country1;
            winformsMap1.Refresh();
        }

        private void btnRotateCounterclockwise_Click(object sender, EventArgs e)
        {
            rotateProjection.Angle += 20;
            winformsMap1.CurrentExtent = rotateProjection.GetUpdatedExtent(winformsMap1.CurrentExtent);
            winformsMap1.Refresh(winformsMap1.Overlays["WorldOverlay"]);
        }

        private void btnRotateClockwise_Click(object sender, EventArgs e)
        {
            rotateProjection.Angle -= 20;
            winformsMap1.CurrentExtent = rotateProjection.GetUpdatedExtent(winformsMap1.CurrentExtent);
            winformsMap1.Refresh(winformsMap1.Overlays["WorldOverlay"]);
        }