container.visitChildren(FormComponent.class, new IVisitor<FormComponent, Void>() {

    @Override
    public void component(final FormComponent component, IVisit<Void> visit) {
        AjaxFormComponentUpdatingBehavior behavior = new AjaxFormComponentUpdatingBehavior("onchange") {
        @Override
        protected void onUpdate(AjaxRequestTarget target) {
            System.out.println("updated " + component.getPageRelativePath());
            target.add(component);
        }
    };
    System.out.println("behavior to " + component.getPath() + " " + component.getClass());
    component.add(behavior);
    }
});