The default action-message selector associated with the control.
- macOS 10.0+
This property contains the action message selector of the receiver's cell. Controls that support multiple cells (such as
NSForm) must supply the appropriate action-message selector in this property. Specify
NULL to prevent action messages from being sent to the receiver's target.
If you want the action-message selector for a control that has multiple cells, it is better to get the selector directly from the cell's own