Informs the delegate that tabView is about to select tabViewItem.
Original signature is '- (void)tabView:(NSTabView *)tabView willSelectTabViewItem:(NSTabViewItem *)tabViewItem'
Available in Mac OS X v10.0 and later.

C# | Visual Basic | Visual C++ |
public event NSTabView..::..TabViewWillSelectTabViewItemEventHandler TabViewWillSelectTabViewItem
Public Event TabViewWillSelectTabViewItem As NSTabView..::..TabViewWillSelectTabViewItemEventHandler
public: event NSTabView..::..TabViewWillSelectTabViewItemEventHandler^ TabViewWillSelectTabViewItem { void add (NSTabView..::..TabViewWillSelectTabViewItemEventHandler^ value); void remove (NSTabView..::..TabViewWillSelectTabViewItemEventHandler^ value); }

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