menu - collapse not working

[thomahawk]

Hi

I have this menu that does work correctly

{menu template="hauptmenu" collapse="1" excludeprefix="english"}

but when I use this, the collapse does not work and subpages of the english directory are still listed:

{menu template="hauptmenu" childrenof="english" collapse="1"}

(english is a section header. The pages it contains are listed. But their subpages should not be listed in the menu, except when the parent is active)

Version informations:
CMS Made Simple™ 1.12.1 “Rontiki”

[DIGI3]

Menu Manager has been deprecated for a couple of years now, and is no longer included with the core. You may wish to upgrade and switch to Navigator.