static function setLastRead($collaborationID, $userID = false, $timestamp = false)
 {
     if ($timestamp === false) {
         $timestamp = time();
     }
     eZCollaborationItemStatus::updateFields($collaborationID, $userID, array('last_read' => $timestamp, 'is_read' => 1));
 }
 function setIsActive($active, $userID = false)
 {
     $active = intval($active);
     eZCollaborationItemStatus::updateFields($this->attribute('id'), $userID, array('is_active' => $active));
 }