[racket] Extending the Racket GUI with native widgets

From: Matthew Flatt (mflatt at cs.utah.edu)
Date: Wed Jan 5 14:18:47 EST 2011

I see... You need `get-client-handle', which returns the inner widget
of a window rather than the outer one. (There are two layers to a
`panel%' for event-handling reasons.)

I've added `get-client-handle' to `window<%>', which you should use
in this case instead of `get-handle'.

Also, don't forget to use `gtk:widget-show'.

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