[racket] how to add text-field-style behavior to rectangles drawn on a canvas

On 10/05/11 15:02, Matthew Flatt wrote:
> At Wed, 05 Oct 2011 15:00:06 +0200, Marijn wrote:
>> Suppose one has a spreadsheet-like grid drawn on a canvas%. How does
>> one add text-field%-style behavior to the rectangles drawn?
> 
> You could implement an `editor-admin%' subclass to manage a `text%'
> within the grid.

I've prepared a chopped-down attempt which defines an editor, an
administrator and a display class and instantiates them.

Unfortunately the editor doesn't appear on the screen where I thought
I'd let the administrator tell it to appear.

I'm not sure why it doesn't work. Any help?

Marijn
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