/**
  * @return EngineBlock_Form_GroupProviderGroupMemberFilter
  */
 public function _initGroupProviderId()
 {
     $element = new Zend_Form_Element_Hidden('group_provider_id');
     $element->setRequired(TRUE);
     $element->setAllowEmpty(false);
     return $this->addElement($element);
 }
 /**
  * @return EngineBlock_Form_VirtualOrganisationIdp
  */
 public function _initVOId()
 {
     $element = new Zend_Form_Element_Hidden('vo_id');
     $element->setRequired(TRUE);
     $element->setAllowEmpty(false);
     return $this->addElement($element);
 }