title: Background agent task is never executed in Mango
body: <p>I have a background agent that i would like to be executed in Mango for updating the live tile.
  The problem is that it is never executed.
  Here is the code that i used:</p>
  
  <pre><code>//start background agent 
  PeriodicTask periodicTask = new PeriodicTask("BruceWpAgent");
  
  periodicTask.Description = "BruceWp periodic live task";
  periodicTask.ExpirationTime = System.DateTime.Now.AddDays(10);
  
  // If the agent is already registered with the system,
  if (ScheduledActionService.Find(periodicTask.Name) != null)
  {
       ScheduledActionService.Remove("BruceWpAgent");
  }
  
  ScheduledActionService.Add(periodicTask);
  </code></pre>
  
  <p>I've found my app name between that Apps that use background jobs but the task is never invoked.
  What am i doing wrong?</p>