[plt-scheme] scroll bars on definition window

From: Jon Rafkind (workmin at ccs.neu.edu)
Date: Sun Nov 30 03:57:14 EST 2008

I'd like to be able to adjust the scrollbars programmatically via 
set-scroll-pos/get-scroll-pos in Drscheme but I cannot find the proper 
canvas to use. If I call `get-canvas' on the current tab thing I get a 
definitions-canvas% back which apparently doesn't extend canvas%.

How can I get the object that controls the scrollbars on the definitions 

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