EditInteractiveOverlay labelOverlay;
        private void DisplayMap_Load(object sender, EventArgs e)
        {
            labelOverlay = new EditInteractiveOverlay();

            TextStyle unitTextStyle = new TextStyle("UnitLabel", new GeoFont("Arial", 10), new GeoSolidBrush(GeoColor.SimpleColors.Red));
            unitTextStyle.XOffsetInPixel = 20;

            TextStyle callTextStyle = new TextStyle("CallLabel", new GeoFont("Arial", 10), new GeoSolidBrush(GeoColor.SimpleColors.Red));
            callTextStyle.XOffsetInPixel = 20;

            ValueStyle labelValueStyle = new ValueStyle();
            labelValueStyle.ColumnName = "UnitLabel";
            labelValueStyle.ValueItems.Add(new ValueItem("U", unitTextStyle));
            labelValueStyle.ValueItems.Add(new ValueItem("C", callTextStyle));

            labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.CustomStyles.Add(labelValueStyle);
            labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            labelOverlay.EditShapesLayer.Open();
            labelOverlay.EditShapesLayer.Columns.Add(new FeatureSourceColumn("UnitLabel"));
            labelOverlay.EditShapesLayer.Close();
            addFeaturee();

            winformsMap1.CurrentExtent = new RectangleShape(-180, 90, 180, -90);
            winformsMap1.InteractiveOverlays.Add("Labels", labelOverlay);

            labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle.IsActive = false;
            labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle.IsActive = false;
            labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle.IsActive = false;
            labelOverlay.EditShapesLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle.IsActive = false;
            winformsMap1.Refresh();
        }

        private void addFeaturee()
        {
            PointShape pointShape = new PointShape(0, 0);
            pointShape.Tag = "test";

            Feature fl = new Feature(pointShape);
            fl.ColumnValues["UnitLabel"] = "U";
            labelOverlay.EditShapesLayer.InternalFeatures.Add("testFeature", fl);
        }