Returns the index of the first menu item in the receiver identified by a tag.
Original signature is '- (NSInteger)indexOfItemWithTag:(NSInteger)aTag'
Available in Mac OS X v10.0 and later.


- aTag (NSInteger)
- An integer tag associated with the menu item of the receiver.

The integer index of the menu item or, if no such menu item is in the menu, –1.

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