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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