Inheritance: ForcedPresentWindow
		public static NoteRecentChanges GetInstance (NoteManager manager)
		{
			if (instance == null)
				instance = new NoteRecentChanges (manager);
			System.Diagnostics.Debug.Assert (
				instance.manager == manager,
				"Multiple NoteManagers not supported");
			return instance;
		}
		void OnCloseWindow (object sender, EventArgs args)
		{
			// Disconnect external signal handlers to prevent bloweup
			manager.NoteDeleted -= OnNotesChanged;
			manager.NoteAdded -= OnNotesChanged;
			manager.NoteRenamed -= OnNoteRenamed;
			manager.NoteSaved -= OnNoteSaved;

			Notebooks.NotebookManager.NoteAddedToNotebook -= OnNoteAddedToNotebook;
			Notebooks.NotebookManager.NoteRemovedFromNotebook -= OnNoteRemovedFromNotebook;

			// The following code has to be done for the MenuBar to
			// appear properly the next time this window is opened.
			if (menu_bar != null) {
				content_vbox.Remove (menu_bar);
				ActionManager am = Tomboy.ActionManager;
				am ["OpenNoteAction"].Activated -= OnOpenNote;
				am ["DeleteNoteAction"].Activated -= OnDeleteNote;
				am ["NewNotebookAction"].Activated -= OnNewNotebook;
				am ["DeleteNotebookAction"].Activated -= OnDeleteNotebook;
				am ["NewNotebookNoteAction"].Activated -= OnNewNotebookNote;
				am ["OpenNotebookTemplateNoteAction"].Activated -= OnOpenNotebookTemplateNote;
				am ["CloseWindowAction"].Activated -= OnCloseWindow;
			}

			SavePosition ();
			Tomboy.ExitingEvent -= OnExitingEvent;

			Hide ();
			Destroy ();
			instance = null;
#if !MAC
			if (Tomboy.TrayIconShowing == false &&
			    (bool) Preferences.Get (Preferences.ENABLE_TRAY_ICON))
				Tomboy.ActionManager ["QuitTomboyAction"].Activate ();
#endif
		}