Zend_Form -> Nicely change setRequired() validate message

Question

Say I create a text element like this:

$firstName = new Zend_Form_Element_Text(\'firstName\');
$firstName->setRequired(true);

Whats

Answer 1

But try this:

$firstName->setRequired(true)
          ->addValidator('NotEmpty', false, array('messages' => 'bar'))
          ->addValidator('Alpha', false, array('messages'=>'Must contain only letters'));

If left empty and submitted, itll give two messages bar & '' is an empty string. Its that second message thats coming from setRequired(true) thats the problem