One Quickie

Becoming firstResponder if you don't have an editable cell (NSView->Hacks)
You make a custom view, add it to your window in Interface Builder, and you make it the first responder. When you run the program, your custom view is not the first responder, instead some lame-O textfield has snagged keyboard focus. To address this, override this undocumented method:
- (BOOL) _hasEditableCell
    return (YES);
} // _hasEditableCell
This workaround is necessary at least for Mac OS X 10.1.*.

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Advanced Mac OS X Programming book