obtener campos custom UI en Wordpress

register_post_type( 'location',
    array(
	  'labels' => array(
	    'name' => __( 'Locations' ),
	    'singular_name' => __( 'Location' )
	  ),
	  'public' => true,
	  'show_ui' => true,
	  'supports' => array('title',
			    'editor',
			    'thumbnail',
			    'excerpt',
			    'custom-fields'
		    ),
	  'rewrite' => array('slug' => 'locations')
    )
  );