public Object execute(ExecutionEvent event) throws ExecutionException {

    IJavaScriptElement javaElement =
        (IJavaScriptElement) event.getObjectParameterForExecution(PARAM_ID_ELEMENT_REF);

    PackageExplorerPart view = PackageExplorerPart.openInActivePerspective();
    view.tryToReveal(javaElement);

    return null;
  }