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Can you clarify exactly what you are talking about. Are you asking for suggestions as to what custom class hierarchy to use, or what Flex components to use?
Maybe you can start by providing an overall description of the app you are creating, and how your question fits into your considerations in approaching the design of that app.
You need to create event notification between the objects.
Object A dispatches an event when it changes. Objects B and C listen for events from A and take action accordingly.
Look at classes EventDispatcher and Event