how to center a panel within another panel?

Hi,

I use DockLayoutPanel as the RootPanel for my browser window. And I
want to place another "child" panel within the dockpanels center.

Well, the child panel is always aligned to the upper left.

How can I achieve that:

a) the DockLayoutPanel really covers the whole browser window
b) the child panel is centered within the DockLayoutPanel's center
(but not resized)

Thank you
Magnus

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