public function getHtml()
 {
     $hidden = new Varien_Data_Form_Element_Hidden($this->getData());
     $hidden->setData('label', null);
     $hidden->setForm($this->getForm());
     $this->setId($this->getId() . '_query');
     $this->setName($this->getId());
     $this->setValue($this->_value);
     return $hidden->getHtml() . parent::getHtml() . $this->_getJs();
 }