> Why does that crash when the first does not?  Are subclasses required to
> have member variables, or can they just have new functions?  Mine don't have
> any variables, maybe that is the problem?

See:

    
<http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/chapter_3_section_9.html#//apple_ref/doc/uid/TP40002974-CH4-DontLinkElementID_105>

-- Chris
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