Can I add a DataMember to a CollectionDataContract in WCF?

I have a collection class that I have decorated with a CollectionDataContract. The collection class also has a property on the class that I would like to be passed to the service client. I have tried adding [DataMember] to that property but it didn't add it to the class in the client when I updated.

Any WCF experts out there have any help to offer?