title: setGroup() is undefined for the type NotificationCompat.Builder?
body: <p>I like to have a stck type notification for my message app which is a webapp.
  My notifications are working..But each time a new notification comes the previous notification dissapears and new one comes. When i googled i found that setGroup can be used. But whe i used it it is showing that</p>
  
  <p>setGroup() is undefined for the type NotificationCompat.Builder.</p>
  
  <p>My notification function is:</p>
  
  <pre><code>    public void CreateNotification(String msg)
      {
          Bitmap largeIcon = BitmapFactory.decodeResource(getResources(),
                  R.drawable.icon);
  
      Intent notificationIntent = new Intent(AndroidMobileAppSampleActivity.this, AndroidMobileAppSampleActivity.class);
      PendingIntent contentIntent = PendingIntent.getActivity(AndroidMobileAppSampleActivity.this, 0, notificationIntent, 0);
       NotificationManager notificationManager = (NotificationManager) AndroidMobileAppSampleActivity.this
                  .getSystemService(Context.NOTIFICATION_SERVICE);
      Notification noti = new NotificationCompat.Builder(AndroidMobileAppSampleActivity.this)
                          .setSmallIcon(R.drawable.icon)
                          .setTicker("New message from "+msg)
  
                          .setWhen(System.currentTimeMillis())
                          .setContentTitle("Mybuzzin")
  
                          .setContentText(msg)
                          .setContentIntent(contentIntent)
                          //At most three action buttons can be added
                          .setAutoCancel(true).build();    
       noti.defaults |= Notification.DEFAULT_SOUND;
       noti.defaults |= Notification.DEFAULT_VIBRATE;
       noti.flags |=Notification.FLAG_SHOW_LIGHTS| Notification.FLAG_AUTO_CANCEL;    
       notificationManager.notify(notifyID, noti);
  }
  </code></pre>