I'm trying to hook up to the BeforeSubmitPostedData event. I'm trying to use the following:

    [InitializableModule]
    [ModuleDependency(typeof(EPiServer.Web.InitializationModule))]
    public class XFormsInitialization : IInitializableModule
    {
        public void Initialize(InitializationEngine context)
        {
            XFormControl.ControlSetup += XFormControlOnControlSetup;
        }

        private static void XFormControlOnControlSetup(object sender, EventArgs eventArgs)
        {
            var control = (XFormControl)sender;
            control.BeforeSubmitPostedData += ControlOnBeforeSubmitPostedData;
        }


        private static void ControlOnBeforeSubmitPostedData(object sender, SaveFormDataEventArgs eventArgs)
        {
            if (eventArgs.FormData.ChannelOptions.HasFlag(ChannelOptions.Email))
            {
                // do stuff
                //eventArgs.FormData.ChannelOptions = eventArgs.FormData.ChannelOptions.Remove(ChannelOptions.Email);
            }
        }

        public void Preload(string[] parameters) { }

        public void Uninitialize(InitializationEngine context)
        {
            XFormControl.ControlSetup -= XFormControlOnControlSetup;
        }
    }

The event is never fired. I'm uising MVC. Is this just a WebForms thing?

I've also tried to hook up to the event with XFormActionHelper.BeforeSubmitPostedData. The event fires correctly, but the ChannelOptions are empty.