Any component like SplitLayoutPanel with percentage support

I'm new to GWT. I have used SplitLayoutPanel to create draggable
splitter between child widgets. However since this component supports
only "px", it is not serving my purpose. I need the divided regions
and child widgets to resize to any browser dimensions onload as well
as on window resize.

Is there any component like SplitLayoutPanel which has draggable
splitter concept along with size in %.

(or)

Is there any way to dynamically set the size of SplitLayoutPanel
onload and on window resize.

Thanks in advance.

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