The parameters you set on results are just that: parameters for the result implementation class--in your case, a "dispatcher" result. They are not available to your action or view side of the result.
You wrote: oh ok. becuase somewhere i read that its available in custom interceptor as a request parameter.
Oh, maybe it is and I just never knew that. Well, maybe I did--but I think it'd be set on the action, so you'd need an action property. Maybe I'll try that out and see what happens. Learn something new every day!