One Quickie

Outlining every view (NSView->Debugging)
You can set the NSShowAllViews default value to have every view outlined. Nested views get outlined in different colors.

Set it "permanently" via

% defaults write NSShowAllViews YES
(or whatever your application identifier is), or use the one-shot version:
/Developer/Applications/ -NSShowAllViews YES

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Advanced Mac OS X Programming book