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Using Protocols

Hello,

I am creating a class for a custom control (a button with rollover states).
This class needs a "helper" class, or a delegate, so I decided to create a
formal protocol that defines all of the functions this delegate class needs
to have so the rollover button can get things like its rollover states and
selectors that should be performed on the different states.

So here is the interface for the custom class:
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