retrieving the size of a panel/widget before it is added

Hi,

when I add a VerticalPanel to the center of a DockLayoutPanel, it will
immediately be stretched to the remaining size of its parent. But I
would like it to keep its natural size, i. e. the size it needs for
its children (and then center it within its parent).

So I tried to get its size, before it is added:

VerticalPanel vp = new VerticalPanel;
//vp.add ...
int xs = p.getOffsetWidth();
int ys = p.getOffsetHeight();
add(vp);

But this size is 0.

So one of the following is needed:
- get the size of the panel before it's added
- prevent it from beeing stretched and then retrieve the size

Are there methods to do this?

Thanks
Magnus

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