How to add a widget to a CaptionPanel?

I am trying to add a widget to a caption of a CaptionPanel. The
problem is that CaptionPanel takes only:
CaptionPanel(String str)
CaptionPanel(HTML html)

and not a widget as a gwt-Checkbox e t c.

How can I add a gwt-widget to a caption of CaptionPanel?
thanx for any suggestions

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