remote collection object needs to serialize

[Dan Holmes]

I am trying to send a strongly typed collection of ISystemMessageData as
efficiently as possible from a remoted object. Originally i defined the
method below to return Dictionary<String, ISystemMessageData>. Then i
got the idea that i could "rename" it by inheriting but not override
anything. That would make it visible as a binding source to the IDE.
However i get serialization errors. I tried to add the [Serializable]
attribute to the class. I am missing a piece but don't know what it is.
If this is the wrong track let me know that too.

SystemMessageDataCollection ListUnSent(Identity id);
public interface ISystemMessageData
{
getters and setters
...
}

//added attribute at one point but got message saying the deserialize
//constructor
//couldn't be found.
{Serializable]
public class SystemMessageDataCollection : Dictionary<String,
ISystemMessageData> { };