Posted as the outline view’s selection changes (while the mouse button is still down).
The notification object is the outline view whose selection is changing. This notification does not contain a userInfo dictionary.
Available in Mac OS X v10.0 and later.


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