I am new in the world of GWT and I haven't used UIBinder yet. But when
I use DockPanelLayout and center must be replaced, the solution I
found on the Internet is overloading DockLayoutPanel and rewriting the
"add" method.

Hope this is useful for you.

public class DockLayoutPanelReplaceable extends DockLayoutPanel {
    @Override
    public void add(Widget widget) {
        if (getCenter() != null) {
           remove(getCenter());
        }
        super.add(widget);
    }
}

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