if (fSelectionChangedListeners == null) {
if (fSelectionChangedListeners == null)
	public void addSelectionChangedListener(ISelectionChangedListener listener) {		if (fSelectionChangedListeners == null) {			fSelectionChangedListeners= new ArrayList(4);		}				if (!fSelectionChangedListeners.contains(listener)) {			fSelectionChangedListeners.add(listener);		}	}