Hi,
The post is a little old but I would just like to share a solution.
In my onModuleLoad() method of the "main" class in my GWT project the first 
thing I do is setting the height of the rootPanel to 100%.

*RootPanel.get().setHeight("100%");*
*
*
>From here I can then work with the rootPanel object to obtain the 
offSetHeight which can then be used to set the height of my other panels.

I have a menuBar which is a horizontalPanel and the height is 60px. Below 
the menu bar I have a flowPanel and I set the height by obtaining the 
rootPanel height - 60px. I fill this flowPanel with a Map where the Width 
and Height is set to100%.

*FlowPanel mapPanel = new FlowPanel();
*
*int height = RootPanel.get().getOffsetHeight() - 60;*
*mapPanel.setHeight((new Integer(height)).toString());*
*mapPanel.add(Map.getMap());*

Hope this helps.

Cheers,

Dennis

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