WebDevStudios/CMB2

Hi everybody. I've already implements this code:
function cmb2_post_search_ajax_metaboxes_example() {

$example_meta = new_cmb2_box( array(
'id' => 'cmb2_post_search_ajax_field',
'title' => __( 'Related Posts', 'cmb2' ),
'object_types' => array( 'movie' ), // Post type
'context' => 'normal',
'priority' => 'high',
'show_names' => true, // Show field names on the left
) );

$example_meta->add_field( array(
'name' => ( 'Example Multiple', 'cmb2' ),
'id' => 'cmb2_post_search_ajax_demo_multiple',
'type' => 'post_search_ajax',
'desc' => ( '(Start typing post title)', 'cmb2' ),
// Optional :
'limit' => 10, // Limit selection to X items only (default 1)
'sortable' => true, // Allow selected items to be sortable (default false)
'query_args' => array(
'post_type' => array( 'movie' ),
'post_status' => array( 'publish' ),
'posts_per_page' => -1
)
) );

$example_meta->add_field( array(
'name' => ( 'Example Single', 'cmb2' ),
'id' => 'cmb2_post_search_ajax_demo_single',
'type' => 'post_search_ajax',
'desc' => ( '(Start typing post title)', 'cmb2' ),
// Optional :
'limit' => 1, // Limit selection to X items only (default 1)
'sortable' => false, // Allow selected items to be sortable (default false)
'query_args' => array(
'post_type' => array( 'movie' ),
'post_status' => array( 'publish' ),
'posts_per_page' => -1
)
) );

}
add_action( 'cmb2_init', 'cmb2_post_search_ajax_metaboxes_example' );