How to create MDI Application with Swing Application Framework?

Hi all,

I have an application built in netbeans in old fashion way, I have seen some
examples of creating application using Swing Application Framework but all
of them with org.jdesktop.application.SingleFrameApplication.

But how about something like MultiFrameApplication? 
Does it exist?

This is an screenshot of one of my applications.
http://www.nabble.com/file/p19228126/MDI-application.jpeg 

Any tutorial anywhere?

Thanks 
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