protected function _ensureRounds($reload = false)
    {
        if ((null === $this->_rounds) || $reload) {
            $rounds = $this->getTrackEngine()->getRoundModel(true, 'index')->load(array('gro_id_track'=>$this->getTrackId()));

            $this->_rounds = array();
            foreach($rounds as $round) {
                $this->_rounds[$round['gro_id_round']] = $round;
            }
        }
    }