Basically you have the choice between either:
1) using observers/ event listeners for notification much like you
would probably do with swing;
2) use a hierarchal model that is shared between components so that
any change in that model is automatically cascaded.

1) is probably more work and has the danger that it causes a domino
effect letting you end up with a zillion listeners, but the advantage
is that you don't need a foreign model and it is more loosely bound.

My personal preference is usually 2). Not that this model hierarchy
can be on the actual model objects as well as on the IModels


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