Resizing parent element when child change size

Hi Everyone,
can anyone give me a hint how can I implement following situation:

I have SimplePanel with child FlowPanel. What I want to do is to
resize SimplePanel in order to fit
FlowPanel when I add new widgets to the FlowPanel.

Is best way to fire some event when i add new widget to FlowPanel and
than catch that event in SimplePanel
implementation?

Or is there any native support for this?

Thank you,
Cheers

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