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[racket] Scroll events in list-box%

From: Laurent (laurent.orseau at gmail.com)
Date: Wed Jul 28 12:21:13 EDT 2010		 
Hi,

I can see there are scroll events and an `on-scroll' method for canvas%, but
not for list-box% or list-control%.
Is there a way to know when a scrollbar is moved in a list-box%?

I need this to synchronize the scrolling of several list-boxes.

Thanks,
Laurent
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