A bug with administrationsettings attribute

Description

Steps to reproduce

1. Set AdministrationSettings attribute for a PageType, such as ArticlePage, and set CodeOnly = true like this:

[AdministrationSettings(
              GroupName = "New Page Types",
              Order = 1,
              CodeOnly = true)]
 public class ArticlePage : StandardPage
    {
        public virtual ContentReference RelatedPage { get; set; }
    }

Expected:
You cannot use the sorting arrows and change the sort order property.

Actual:
You can use the sorting arrows and change the sort order property.