GWT wrapper for visualization treemap with mouse events

A treemap is a helpful visualization of a data tree. It would be nice if the treemap had features like weighted box sizes for intermediate levels and explicitly setting up colors for non-leaf nodes. I wrote a  quick Google Web Toolkit(GWT) wrapper for Google visualization treemap-

 public class TreeMap extends Visualization<TreeMap.Options>
{
   public static class Options extends AbstractDrawOptions {
       public static Options create() {
           return JavaScriptObject.createObject().cast();
       }

       protected Options() { }
   }

   public static final String PACKAGE = "treemap";

   public TreeMap() {
       super();
   }

   public TreeMap(AbstractDataTable data, Options options) {
       super(data, options);
   }

   @Override
   protected native JavaScriptObject createJso(Element parent) /*-{
       return new $wnd.google.visualization.TreeMap(parent);                
   }-*/;
   
   public final void addOnMouseOverHandler(OnMouseOverHandler handler) {
       Handler.addHandler(this, "onmouseover", handler);
   }
   
   public final void addOnMouseOutHandler(OnMouseOutHandler handler) {
       Handler.addHandler(this, "onmouseout", handler);
   }
}