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There are a few different ways to implement M-V-C. In http://www.amazon.co...28725276&sr=8-1, for instance, the authors show a flavor where the Controller subscribes to the Model's published state, and another whether the View subscribes to the Model state directly. In our components the Model publishes its state (in both senses, the current parameter values, and particularly a value that describes in which State it is currently, e.g., DisabledState). Each of our Views has the responsibility of deciding what to display based on the value of the State parameter. It is pretty simple to implement this sort of thing. (There is another flavor of M-V-C where the controller takes a much more active role in determining what the View should display. We have decided to date not to implement that flavor for our purposes.)