if (model != fModel) {
if (model != fModel || model != null) {
	public void setModel(IAnnotationModel model) {		if (model != fModel) {						if (fModel != null)				fModel.removeAnnotationModelListener(fInternalListener);						fModel= model;						if (fModel != null)				fModel.addAnnotationModelListener(fInternalListener);						update();		}	}	