[plt-scheme] mred - button on canvas.

From: Geoffrey King (lordgeoffrey at optushome.com.au)
Date: Wed Jan 24 04:44:28 EST 2007

It started with wanting to set the background colour of an area. So i 
needed a canvas. But once i add a canvas i cant put things on top of it 
- like a button or other containers.

Obviously, it must be possible, but how eludes me. Any hints are 


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