Selects the item in the menu at the specified index.
- macOS 10.0+
The index of the item you want to select, or
-1you want to deselect all menu items.
By default, selecting or deselecting a menu item from a pop-up menu changes its state. Selecting a menu item from a pull-down menu does not automatically alter the state of the item. To disassociate the current selection from the state of menu items, set the
alters property to
Subclassers can override this method to catch all select calls.