Vista - WCF and typed dataset

Hi,

I've a strongly typed dataset that I want to pass as an argument of a WCF
service method.
When I create a service reference to the service using VS, the argument is
type of XmlElement instead of MyDataSet.

Is there any way to keep the strongly typed dataset as type of the argument
?
I'd like to avoir "manual" binding and isolating service contract and
dataset in a separate class library...

Thank in advance,
Steve