Informs the delegate that the number of tab view items in tabView has changed.
Original signature is '- (void)tabViewDidChangeNumberOfTabViewItems:(NSTabView *)tabView'
Available in Mac OS X v10.0 and later.

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- tabView (NSTabView)
- The tab view that added or removed tabview items.

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