I have a DockLayoutPanel, inside the DockLayoutPanel there is some 
FlowPanel plus many DisclosurePanel, I want the content inside the 
DockLayoutPanel can scroll when many of these DisclosurePanel are expanded, 
how to achieve this?
and I found that if I set DockLayoutPanel height to 100%, the 
DockLayoutPanel cannot show anything, it must use a numeric unit like 
setHeight("720px"); why?

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