MorphicDraw, now with Spec, Glamour & PolyMorph

After starting with a PolyMorph window & toolbar, I've now added
a Glamour and Spec one.

Code: http://www.smalltalkhub.com/mc/StephanEggermont/MorphicDraw/main
Documentation: https://github.com/StephanEggermont/MorphicDraw

I find it difficult to explain the choices for event handling.
I'm using both handleListenEvent: and mouseDown: and on:send:to:
and haven't even started using announcements. What am I supposed
to be using when, and what is supposed to be replaced in Bloc?

Stephan