[syslinux] MENU HIDDENKEY help?

[Matt Sephton]

Hi,

I was hoping you could shed some light in usage of the directive MENU HIDDENKEY in syslinux (extlinux 4.04)

The docs say: 
MENU HIDDENKEY key[,key...] command...

So, in my conf I have:

MENU HIDDENKEY Esc openelec

Where openelec is the label of the boot option I want to run only if Esc is pressed. 

But pressing Esc on boot has no effect. Default is run. So, do I misunderstand the "command" part of the directive? If so, are there any examples I can learn from?

My full conf is here: http://pastebin.com/RJuju4RF

The effect I am after is a blank screen that will boot default if nothing is pressed, but if Esc is pressed it will boot an alternate or show the menu. 

Any help appreciated. 

Thank you,
Matt