One Quickie

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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 com.apple.TextEdit NSShowAllViews YES

(or whatever your application identifier is), or use the one-shot version:

/Developer/Applications/Xcode.app/Contents/MacOS/Xcode -NSShowAllViews YES