PopupPanel

http://google-web-toolkit.googlecode.com/svn/javadoc/2.0/com/google/gwt/user/client/ui/PopupPanel.html

Can somebody please tell me from the above doc, which sample project does the PopupPanel image correspond to? (I mean the sample code for the example "Richard Feynman" popup).
I want the exact same functionality, but sizing and placement of popup has been a big issue and I would like to look at this sample code.
thanks

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