Shutdown of XBMC

Hello,

How do I control what the "Quit XBMC application" button does with iOS remote? On my infrared remote, I have this in my keyboard.xml;

<keymap>
<global>
<remote>
<power>System.ExecWait("/usr/local/bin/go_to_sleep")</power>
</remote>
</global>
</keymap>

It works with my IR remote (runs a custom suspend command), but doesn't with the iOS app. I tried adding the same action inside <keyboard></keyboard> directive as well, but that doesn't work either. How do I control, which command the "Quit XBMC application" runs?

Thanks, juhis