public function exclude($iElementID = null)
    {
        if (empty($iElementID) || $this->isEmpty()) {
            return $this->returnThis();
        }

        $iElementIDKey = array_search($iElementID, $this->arElementIDList);
        if ($iElementIDKey === false) {
            return $this->returnThis();
        }

        unset($this->arElementIDList[$iElementIDKey]);

        return $this->returnThis();
    }