How to highlight other then current child in KnpMenuBundle?

$this->get(‘my_bundles.menu.main’)->getChild($menu)->setCurrent(true);

class ...Controller extends Controller
{
    public function showAction(...)
    {
        ...

        $this->highlightMenu('other-child');
    }

    protected function highlightMenu($menu)
    {
        $this->get('my_bundles.menu.main')->getChild($menu)->setCurrent(true);
    }
}