A Place is equivalent to a URL, this is "where you are", and is global to 
your application. Instead of having multiple places at once, you instead 
have ActivityMapper that react differently to the same place. In your case, 
for the default place, your HeaderActivityMapper would return the 
HeaderActivity.
See http://tbroyer.posterous.com/gwt-21-activities 
and http://tbroyer.posterous.com/gwt-21-activities-nesting-yagni

If, however, your header does not change across the whole life time of your 
app, then you don't have to make it a *display region*, with its 
ActivityMapper and Activity, you can just put a Header widget within your 
DockLayoutPanel, just like any widget inside a container widget.

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