"Block" levels

Hi people,

Is it possible to “block” some levels in the menu???

eg

I’ve did setup a menu (off course i did, otherwise i wouldn’t ask to solve this issue 😉 )

World
– Europe
— Belgium
— Civil
— Military

When i open — Civil, i see all civil airports and still can see also — Military
But when i open — Military, — Civil is put behind the screens until i close — Military again

You can find this example @ http://www.inaviapress.com/spotterplaces/world/europe/belgium/melsbroek-air-base/

Is there any possibility that — Civil still be showed when — Military is opened???

Thanks people

https://wordpress.org/plugins/nextend-accordion-menu/