add_action( 'init', function() {
	register_post_type( 'demo-parent-bug', [
		'label' => 'Demo Parent Bug',
		'public' => true,
		'hierarchical' => true,
	] );
} );
add_action( 'fm_post_demo-parent-bug', function() {
	$fm = new Fieldmanager_Autocomplete( array(
		'name' => 'my-parent',
		'datasource' => new Fieldmanager_Datasource_Post( array(
			'only_save_to_post_parent' => true,
			'query_args' => array(
				'post_type' => 'demo-parent-bug',
			),
		) ),
	) );
	$fm->add_meta_box( 'Parent Page', array( 'demo-parent-bug' ), 'side', 'high' );
} );