Returns the index of the column a given point lies in.
Original signature is '- (NSInteger)columnAtPoint:(NSPoint)aPoint'
Available in Mac OS X v10.0 and later.


- aPoint (NSPoint)
- A point in the coordinate system of the receiver.

The index of the column aPoint lies in, or –1 if aPoint lies outside the receiver’s bounds.

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