[fw-mvc] Zend_Form_Element will be created twice

Hi,

why the second hidden element will be created twice?

class EventForm extends My_Form {

public function init() {

$this->addHiddenElement('ID');
$this->addHiddenElement('PARENT_ID');
}
}

class My_Form extends Zend_Form {

protected $_aHiddenDecorators = array(
array('ViewHelper')
);

protected $_aHiddenGroupDecorators = array(
'FormElements'
);

public function loadDefaultDecorators() {
$this->setDecorators(array(
'FormElements',
'Form',
));
}

/**
* builds a hidden element and adds it to the 'hiddenFields' display
group
* if the display group does not yet exists, it will be created
*/
public function addHiddenElement($fp_sName, $fp_aOptions = null) {

$oHidden = $this->createElement('hidden', $fp_sName, $fp_aOptions);
$oHidden->setDecorators($this->_aHiddenDecorators);
$this->addElement($oHidden);

if($this->getDisplayGroup('hiddenFields')) {
$this->getDisplayGroup('hiddenFields')->addElement($oHidden);
} else {
$this->addDisplayGroup(array($oHidden->getName()),
'hiddenFields', array(
'decorators' => $this->_aHiddenGroupDecorators,
));
}
}

<form enctype="application/x-www-form-urlencoded" action=".." method="post">

<input type="hidden" name="ID" value="" id="ID">
<input type="hidden" name="PARENT_ID" value="" id="PARENT_ID">
<input type="hidden" name="PARENT_ID" value="" id="PARENT_ID">

</form>

thank you for any help,

Axel
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