add_action( 'init', 'rtl_shows_cmbf', 9999 );
/**
 * Initialize the metabox class.
 */
function rtl_shows_cmbf() {

    if ( ! class_exists( 'cmb_Meta_Box' ) )
        require_once(get_template_directory() . "/lib/cmbf/init.php" ) ;
}