How to change only one widget and leave the others the same with GWT's built in MVP-framework?

I'm just getting started using the built in MVP framework in GWT 2.1 and I have, what I think, a very simple question.

When I read the official tutorial here or look at the gwt-plattform example here, one view always replaces another view.

But what if I want to have a specific widget on all my "pages". As an example you can take the bar at the top of this page, with the StackExchange-logo, your user name and so on. That bar is the same on all pages you can visit, whether you look at a question or a user profile.

How would I get something similar with 开发者_如何学Cthe MVP-framework?

Instead of using the RootPanel as the Activities' container, lay your header panel and SimplePanel inside the RootPanel and use the SimplePanel for your Activities.