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Next, to complete the model–view–controller illustration, you need to
attach the model to a controller. You attach a controller in the same way
that you attach a dependent part, using a model: message. As are
dependent parts, the model is placed in a model instance variable.
The controller does not become part of the list to which update:
messages are sent, however:
Workspace
C := ControllerSubclass new.
C model: M.