title: ServiceStack - use customized registration?
body: <p>i created a customized user table for authentication purpose. When i tried to register an user, the built-in registerservice.cs went to UserAuth so a </p>
  
  <pre><code>""ResponseStatus": {
      "ErrorCode": "InvalidCastException",
      "Message": "Unable to cast object of type 'ServiceStack.Auth.UserAuth' to type 'SOS.Api.ServiceModel.Types.User'.","
  </code></pre>
  
  <p>was thrown. I know i can extend registerservice.cs, but how do i use the customized .cs? in <code>AppHost.cs</code> <code>Plugins.Add(new RegistrationFeature());</code> or something? Thanks.</p>