Take the 2-minute tour ×  I've found a workaround, but I had
trouble earlier this week working with FluorineFx, where I had a
Linq-to-SQL–generated object I wanted to send over the wire to
Flash. This object contained a property that Flash didn't need:
[Association(Name="User_UserEntry", Storage="_UserEntries",
ThisKey="UserID", OtherKey="UserID")] public
EntitySet<UserEntry> UserEntries { ... }  But Flex couldn't
handle reinflating this type, throwing:  ArgumentError: Error
#2173: Unable to read object in stream. The class
flex.messaging.io.ArrayCollection does not implement
flash.utils.IExternalizable but is aliased to an externalizable
class.  Now I didn't need to send the property over the wire, so
I tried the steps that Marc Gravell suggested in issue 456624,
firstly adding attributes to it using the MetadataTypeAttribute
in System.ComponentModel.DataAnnotations (found from JasonW's
comment on issue 393687:  public partial class User { }
internal class UserMetadata     public EntitySet<Use