DockLayoutPanel Sample Code No Style Issue

I tried the DockLayoutCode which is presented in the Javadoc:
http://google-web-toolkit.googlecode.com/svn/javadoc/2.0/com/google/gwt/user/client/ui/DockLayoutPanel.html
DockLayoutPanel p = new DockLayoutPanel(Unit.EM);
p.addNorth(new HTML("header"), 2);
p.addSouth(new HTML("footer"), 2);
p.addWest(new HTML("navigation"), 10);
p.add(new HTML("some content"));

// I added this:
RootLayoutPanel.get().add(p);
All this code was obviously placed inside the onModuleLoad
substituting the sample Eclipse startup code when you create a new
GWT app. The output looked nothing like what was presented on
DockLayoutPanel in the Developer's Guide:
http://code.google.com/webtoolkit/doc/latest/DevGuideUiPanels.html

Am I missing a css or something else really simple?
Thanks!
-m

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