public function initMxmaps($overrideExisting = true)
    {
        if (null !== $this->collMxmaps && !$overrideExisting) {
            return;
        }

        $collectionClassName = MxmapTableMap::getTableMap()->getCollectionClassName();

        $this->collMxmaps = new $collectionClassName;
        $this->collMxmaps->setModel('\eXpansion\Bundle\Maps\Model\Mxmap');
    }