[racket] System tray in win32

From: kevin2059 (kevin2059 at 163.com)
Date: Fri Aug 24 03:11:32 EDT 2012

Is there any way to make a  app with system-tray  in racket ?
I try to use win32api via ffi/unsafe , but  i can not find or overwrite the
WindowProc callback function of a top-level-windows  。
How can I do this?
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