There are several approaches to solving the communication issues
you're facing, including delegation, notifications, the responder
chain, etc.
Rather than summarizing them (poorly) myself, I'll just point you to
Apple's discussion of them:
http://developer.apple.com/documentation/Cocoa/Conceptual/
CocoaFundamentals/CommunicatingWithObjects/chapter_6_section_1.html
http://developer.apple.com/documentation/Cocoa/Conceptual/
CocoaFundamentals/CocoaDesignPatterns/chapter_5_section_3.html
Cheers,
Ken
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