code: public void onClick(MenuItemClickEvent event) {
  		final FeatureTransaction ft = mapWidget.getMapModel().getFeatureEditor().getFeatureTransaction();
  		if (ft != null && index != null) {
  			List<Feature> features = new ArrayList<Feature>();
  			features.add(ft.getNewFeatures()[index.getFeatureIndex()]);
  			LazyLoader.lazyLoad(features, GeomajasConstant.FEATURE_INCLUDE_GEOMETRY, new LazyLoadCallback() {
  
  				public void execute(List<Feature> response) {
  					controller.setEditMode(EditMode.INSERT_MODE);
  					Geometry geometry = response.get(0).getGeometry();
  					if (geometry instanceof Polygon) {
  						geometry = addRing((Polygon) geometry);
  					} else if (geometry instanceof MultiPolygon) {
  						geometry = addRing((MultiPolygon) geometry);
  					}
  					ft.getNewFeatures()[index.getFeatureIndex()].setGeometry(geometry);
  					controller.setGeometryIndex(index);
  					controller.hideGeometricInfo();
  				}
  			});
  		}
  	}
docs: Insert a new point in the geometry at a given index. The index is taken from the context menu event. This
  function will add a new empty interior ring in the polygon in question.
  
  @param event
  The {@link MenuItemClickEvent} from clicking the action.