I have created a base business object which all of my BOs will inherit from.  This will handle among other thing, auditing user changes to data.  For each BO, I need to hold a list of AuditedFields so it know which fields it cares about changes on.  I have this working fine by using the same concept as the RequiredFields collection.  However, I would like for all fields to be checked by default instead of unchecked.  I have the following in the constructor of the base business object, which I thought would work:

If Me.AuditUserChanges And Me.AuditedFields.Count = 0 Then
  For Each field As String In Me.AllFieldsList.ToArray
    Dim AuditField As New RequiredField()
    AuditField.FieldType = Me.FieldDbTypes(field)
    AuditField.FieldName = field
    AuditedFields.Add(AuditField)
  Next
End If

So basically, I'm just saying if i'm auditing and haven't selected any fields to audit, go ahead and default to audit all of them by adding each field from the AllFieldsList to the AuditedFields collection.  The problem is that when I open any of the inherited BOs in the designer I get the following error message:

A class that inherits from MicroFour.StrataFrame.BusinessLayer must implement the AllFieldsList property.

Any idea what is going on here?  Am I just not using the AllFieldsList collection correctly here?  Is there a better way to accomplish what I'm trying to do?