Adding an Area to DashedRouteHandler

[HoomanBahreini]

I tried the following code to add a new Area, as mentioned in documentation file:

public class B2bAreaRegistration : AreaRegistration
{
    public override string AreaName
    {
        get { return "B2b"; }
    }

    public override void RegisterArea(AreaRegistrationContext context)
    {
        var b2bDefaultRoute = new LowercaseDashedRoute(
            "B2b/{controller}/{action}/{id}",
            new RouteValueDictionary(new { action = "index", id = UrlParameter.Optional }),
            new DashedRouteHandler(),
            //this, 
            //context,
            new[] { "MyDomain.Web.Areas.B2b.Controllers" }
        );
        context.Routes.Add("B2b_default", b2bDefaultRoute);
    }
}

The above code was not setting the Area correctly, i.e. the following was not being set:

    HttpContext.Current.Request.RequestContext.RouteData.DataTokens["area"]

If I uncomment the 2 commented lines, (AreaRegistration and AreaRegistrationConext ) then it would work correctly and it would set the area. However the example in the documentation does not mention anything about these 2 parameters... I am not sure if this is my misunderstanding, or a bug? Or perhaps just an outdated documentation...