problem about [[UIApplication sharedApplication] setIdleTimerDisabled:YES];
<p>I got a problem when disable/enable the iphone idle function.</p>

<p>I try to use <code>[[UIApplication sharedApplication] setIdleTimerDisabled:YES];</code> to disable the iphone idle function, and it works fine.</p>

<p>Then i try to use <code>[[UIApplication sharedApplication] setIdleTimerDisabled:NO];</code> to enable the idle function in a button click event. But it turned out to be not working.</p>

<p>I use my ipod touch device(OS4.1) to test this function. Any idea?</p>
