Integrating silverlight 3 polling duplex with unity container

These days everybody are using IOC container so I tried to integrate SL 3 Beta(MIX09) Sample chat application that represent how to work with polling duplex with Unity Ioc container. This sample chat application is available for download on codeplex. After looking how to integrate Unity with Wcf I have founded few nice examples. All those examples are pretty much same. To integrate Unity with Wcf we must create UnityServiceHostFactory and in markup of service say that service use that factory. Polling duplex however has also DuplexServiceFactory. So how I integrate those two factories?