void HandleTagSelectionPopupMenu (object sender, PopupMenuArgs args)
	{
		TagPopup popup = new TagPopup ();
		popup.Activate (null, null, tag_selection_widget.TagHighlight);
		args.RetVal = true;
	}
	void HandleTagSelectionButtonPressEvent (object sender, ButtonPressEventArgs args)
	{
		if (args.Event.Button == 3) {
			TagPopup popup = new TagPopup ();
			popup.Activate (args.Event, tag_selection_widget.TagAtPosition (args.Event.X, args.Event.Y),
			tag_selection_widget.TagHighlight);
			args.RetVal = true;
		}
	}