$this->_mailingId = CRM_Utils_Request::retrieve('mid', 'Positive', $this);
$this->_action = CRM_Utils_Request::retrieve('action', 'String', $this);
// check for action permissions.
if (!CRM_Core_Permission::checkActionPermission('CiviMail', $this->_action)) {
$this->_mailingId = CRM_Utils_Request::retrieve('mid', 'Positive', $this);
$this->_action = CRM_Utils_Request::retrieve('action', 'String', $this);
// check for action permissions.
if (!CRM_Core_Permission::checkActionPermission('CiviMail', $this->_action)) {