RootLayoutPanel uses absolute positioning while RootPanel does not use 
absolute positioning and is either the <body> element or any other DIV 
element with a given ID if you use RootPanel.get("id"). So RootLayoutPanel 
fills the whole browser window by default while RootPanel.get() is only as 
heigh as its content.

In your case I think you can do:

RootPanel root = RootPanel.get("id");
root.setSize("100%", "100%");
dockLayoutPanel.setSize("100%", "100%");
root.add(dockLayoutPanel);

Because you use DockLayoutPanel and you dont put it into a RootLayoutPanel 
you may also need to listen for window resize events and call onResize() on 
the dockLayoutPanel. Thats something that RootLayoutPanel does 
automatically for all its children. 

-- J.

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