public static void Index(this IInspector inspector, IInspector parentInspector, string memberName, IInspector grandParentInspector = null)
 {
     inspector.SetColumnsAttribute("Index", Layer.UserSupplied,
                                   () => $"Idx_{grandParentInspector?.GetInstanceName() ?? parentInspector.GetInstanceName()}_{memberName}".ToConventionCase(),
                                   (c) => c.Index == "___Indexable");
 }