$page->add('Button')->set('click me')->js('click')
  ->univ()->alert('Thank you');

$bs=$page->add('ButtonSet');

$b1=$bs->addButton('Hide Myself');
$b1->js('click')->hide();

$b2=$bs->addButton('Hide next button');
$b3=$bs->addButton('Hide prev button');
$b2->js('click',$b3->js()->fadeOut('slow'));
$b3->js('click',$b2->js()->fadeOut('slow'));

$bs->addButton('Show all buttons')
  ->js('click',array(
    $b1->js()->show(),
    $b2->js()->show(),
    $b3->js()->show()
    ));