i found the solution here:
set the height to 100%
<g:DockLayoutPanel unit="PX" height="100%">
...
</g:DockLayoutPanel>
you can use unit='EM' if you want to
https://groups.google.com/group/google-web-toolkit/browse_thread/thread/29d35978188355af/787ccd1da9f3dfc5?pli=1
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