Have you seen this?:
<http://bike-nomad.com/squeak/> at the bottom of the page:

Squeak implementation of Miro Samek's ideas from Practical Statecharts in C/C++
This zip contains just the FSM code from the Connectors 2 package. It can be used by itself. Squeak/MIT license
download SqueakQHsm.zip

Ken


>Date: Wed, 18 Apr 2007 19:05:33 -0400
>From: "Ralph Boland" <rpboland at gmail.com>
>Subject: Need to draw finite state machines (Again)
>To: squeak-dev at lists.squeakfoundation.org
>Message-ID:
>	<fd59e9e70704181605p3f5b5d90xb49b940c2fef490d at mail.gmail.com>
>Content-Type: text/plain; charset="iso-8859-1"
>
>Thanks for the responses for my posting on my need to draw finite state
>machines.   For example: