disabling and enabling screen time-out

[schlag]

Disabling the screen time-out works, but enabling it again after disabling it doesn't work.

Disable:

NativeApplication.nativeApplication.systemIdleMode = SystemIdleMode.KEEP_AWAKE;

Enable (doesn't work after disabling):

NativeApplication.nativeApplication.systemIdleMode = SystemIdleMode.NORMAL;

Anybody have this same problem or a solution?

Thanks!