WCF ClientProxy Events Windows Forms Best Practice.

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event

I have a WCF client proxy [basically encapsulated as an object ] from here: C# WCF Client/Server without HTTP with Callbacks Made Easy [^]

I would like that my winforms application handle the callback data but since my proxy implements the interface making a nice encapsulation - I need to expose those changes - should I create an event in my proxy or is there a better or more correct way to do this?

My interface members basically exists like this and is implemented by the ClientProxy

interface IWCFCallback
{
		[OperationContract(IsOneWay = true)]
		void OnBrandDataChanged(List<BRAND> brandList);	
}

in the proxyClass

ClientProxy : IWCFCallback
{

		public void OnBrandDataChanged(List<BRAND> brandList)
		{
// SHOULD I Raise an event here that this List<BRAND> can be made available out side of the proxy and my Windows Forms application can subscribe to the event. Or is there another more accepted or better way this can be available to my Winform application ?
			throw new NotImplementedException();
		}

}