Inheritance: System.EventArgs
 private void OnNewGroup(object sender, GroupEventAgrs args)
 {
     foreach (var listener in this.listeners)
     {
         ProcessGroup(listener, args.Group);
     }
 }
 private void OnNewGroup(object sender, GroupEventAgrs args)
 {
     foreach (var listener in this.listeners)
         ProcessGroup(listener, args.Group);
 }