[racket] Need Help With Keybindings

Hi, everyone;

I'd like to rebind some of the DrRacket
editor keys.  (I'm trying to reproduce the
idiosyncratic editor layout I'm used to;
it has an emacs flavor but with different
keys.)

To start, I just want to map ^t to move
up a line, ^v to move down, ^f to move
left, and ^g to move right.

I created this file ("keys.rkt"):

#lang s-exp framework/keybinding-lang

(keybinding "c:t" (lambda (editor evt) (send editor previous-line)))
(keybinding "c:v" (lambda (editor evt) (send editor next-line)))
(keybinding "c:f" (lambda (editor evt) (send editor backward-character)))
(keybinding "c:g" (lambda (editor evt) (send editor forward-character)))


I add the file using "Add User-defined
Keybindings" in DrRacket.  But I get
this message as soon as I type one of
my rebound keys:

Error running keybinding .../Scheme/keys.rkt:18:18

send: no such method: previous-line for class: ...engine/test-tool.scm:36:6


It's complaining about the previous-line
method, but that's listed in section 7
(Editor Functions) of the Racket Graphical
Interface Toolkit manual:
http://docs.racket-lang.org/gui/Editor_Functions.html?q=Editor_Functions&q=editor%25&q=forward-select-word&q=key%20bindings

I'm running Racket 5.1.3 on a two-year-old
MacBook Pro under OS X 10.7 Lion.

I'd be grateful for any assistance.

Thanks,

--DGK
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