$contactRelationships = $selector = NULL;
CRM_Utils_Hook::searchColumns('relationship.columns', $columnHeaders, $contactRelationships, $selector);
$this->assign('columnHeaders', $columnHeaders);
$contactRelationships = $selector = NULL;
CRM_Utils_Hook::searchColumns('relationship.columns', $columnHeaders, $contactRelationships, $selector);
$this->assign('columnHeaders', $columnHeaders);