@Nullable
  public static GrMember findClassMemberContainer(@NotNull GrReferenceExpression ref, @NotNull PsiClass aClass) {
    for (PsiElement parent = ref.getParent(); parent != null && parent != aClass; parent = parent.getParent()) {
      if (parent instanceof GrMember && ((GrMember)parent).getContainingClass() == aClass) {
        return (GrMember)parent;
      }
    }
    return null;
  }
@Nullable
  public static GrMember findClassMemberContainer(@NotNull GrReferenceExpression ref, @NotNull PsiClass aClass)