impresspages - How to create a menu from sub pages of a menu item AND use attributes/class on ul? -

i understood how create menu child elements of specific page (e.g. id=5) this:

$pages = \ip\menu\helper::getchilditems($pageid = 5); echo ipslot('menu', $pages); 

works far. formatting due lack of bootstrap classes enhancable.

but how can add custom classes ul of menu? this:

$options = array(     'items' => 'menu2',      'attributes' => array('class' => 'nav nav-stacked') ); echo ipslot('menu', $options); 

but how can combine these 2 methods?

all in formation in documentation - https://www.impresspages.org/docs/navigation ("add custom menu items").

items variable supports menu objects, too.

in case final solution should this:

$pages = \ip\menu\helper::getchilditems($pageid = 5);     $options = array(     'items' => $pages,      'attributes' => array('class' => 'nav nav-stacked') ); echo ipslot('menu', $options);