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Of course, you can define a controller to send the sort of messages expected by a value holder:
ControllerSubclass class definition Controller subclass: #ControllerSubclass instanceVariableNames: '' classVariableNames: '' poolDictionaries: '' category: 'Experiment' ControllerSubclass method definition • instance simulateClick Transcript show: 'Button click simulated'; cr. self model value: (self model value + 1).
Then, the controller can write into the same value holder that sends updates to the viewer:
Workspace C := ControllerSubclass new. C model: H. C simulateClick. Transcript Button click simulated Sample viewer receiving #value update message Value, determined in viewer, is 2