public function SaveAttribute($UserID, $Attribute, $Value = '') {
      // Make sure that changes to the current user become effective immediately.
      $Session = Gdn::Session();
      if ($UserID == $Session->UserID)
         $Session->SetAttribute($Attribute, $Value);

      return $this->SaveToSerializedColumn('Attributes', $UserID, $Attribute, $Value);
   }