Screen lock button doesn't silence UILocalNotification sound
<p>I have an application that uses the UILocalNotification when in the background to alert the user to open the app when something of interest happens. The notification plays a sound (specified using the soundName property). This is all okay however, is there a way to stop the UILocalNotification sound when the user presses the screen lock button? </p>

<p>I found the users are used to pressing this button to silence the phone's ringtone without answering it and they expect to do the same with my app.</p>
