Boo.BooLangProject.HierarchyListener.StartListening C# (CSharp) Method

        public void StartListening()
        {
            Scan(RootItem);

            RaiseCompleteEvent();
        }

 public void StartWatchingHierarchy(IVsHierarchy hierarchy)
 {
     hierarchyListener = new HierarchyListener(hierarchy);
     hierarchyListener.ItemAdded += hierarchyListener_ItemAdded;
     hierarchyListener.Complete += hierarchyListener_Completed;
     hierarchyListener.StartListening();
 }