gwt - Vaadin extension: MouseOverHandler -

in simple extension add vhorizontallayout vlabel. layout add mouseoverhandler, method never invoked. wrong?

(everything else works - i.e. label displayed below extended field)

connector:

@connect(myextension.class) public class myextensionconnector extends abstractextensionconnector {  private static final logger log = logger.getlogger(myextensionconnector.class.getname());   private final vhorizontallayout layout = new vhorizontallayout();  @override protected void extend(serverconnector target) {     log.info("-->extend");     vlabel label = new vlabel();     label.settext("some text");     layout.add(label);      final widget field = ((componentconnector) target).getwidget();      field.addattachhandler(new attachevent.handler() {         @override         public void onattachordetach(attachevent event) {             log.info("-->onattachordetach: " + event.todebugstring());             if (event.isattached()) {                 field.getelement().getparentelement().insertafter(layout.getelement(), field.getelement());                 layout.addhandler(new mouseoverhandler() {                     @override                     public void onmouseover(mouseoverevent event) {                         log.info("-->onmouseover: " + event);                     }                 }, mouseoverevent.gettype());             } else {                 element parentelement = layout.getelement().getparentelement();                 if (parentelement != null) {                     parentelement.removechild(layout.getelement());                 }             }         }     }); } } 

one should use adddomhandler instead of addhandler!