Returns the expansion cell frame for the receiver.
Original signature is '- (NSRect)expansionFrameWithFrame:(NSRect)cellFrame inView:(NSView *)view'
Available in Mac OS X v10.5 and later.

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The expansion cell frame for the receiver. If the frame is not too small, return an empty rect (NSZeroRect), and no expansion tool tip view will be shown.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)