You could use a 
LayoutPanel<http://google-web-toolkit.googlecode.com/svn/javadoc/2.2/com/google/gwt/user/client/ui/LayoutPanel.html>:
 
using (top,height)=(0,100%)+(left,width)=(0,100%) (which actually is the 
default if you don't say anything) the widget will fill the panel; using 
other combinations you could position and size widgets the way you want (you 
have to give the width and height when adding the widget though, contrary to 
AbsolutePanel).

...or you could have your base class be a Composite and let subclasses call 
the initWidget with the appropriate widget for their requirements: 
LayoutPanel or AbsolutePanel.
(in general, you should compose rather than extend)

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