title: How to keep Windows Phone app running in foreground
body: <p>I'm building an app for Windows Phone 8, and the nature of the app requires that it keeps running in the foreground with no user interaction (similar to turn-by-turn navigation apps).  While I can find plenty of information on how to keep an app running in the background (for location tracking, etc), I can't find anything specifying how to keep the app running in the foreground without locking.</p>
  
  <p>Does anyone know how this is done?  Thanks in advance.</p>