IWorkingSet ws1= e1 instanceof IWorkingSet ? (IWorkingSet)e1 : null; IWorkingSet ws2= e2 instanceof IWorkingSet ? (IWorkingSet)e2 : null; if (ws1 == null || ws2 == null) return super.compare(viewer, e1, e2); return 0;
if (e1 instanceof IWorkingSet || e2 instanceof IWorkingSet) return 0;  return super.compare(viewer, e1, e2);
	public int compare(Viewer viewer, Object e1, Object e2) {		IWorkingSet ws1= e1 instanceof IWorkingSet ? (IWorkingSet)e1 : null;		IWorkingSet ws2= e2 instanceof IWorkingSet ? (IWorkingSet)e2 : null;		if (ws1 == null || ws2 == null)			return super.compare(viewer, e1, e2);		return 0;	}