Returns the computed value for a specific ordinal position in the list.
Original signature is '- (NSString *)markerForItemNumber:(NSInteger)itemNum'
Available in Mac OS X v10.4 and later.


- itemNum (NSInteger)
- The ordinal position in the list whose computed marker value is desired.

The computed maker value for itemNum.

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