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# selectionIsChangingNotification

Posted whenever the pop-up list selection of the `NSComboBox` is changing.

```
class let selectionIsChangingNotification: NSNotification.Name
```

## Discussion

The notification object is the `NSComboBox` whose selection is changing. This notification does not contain a `userInfo` dictionary.

To observe this notification using Swift concurrency, use [`NSComboBox.SelectionIsChangingMessage`](/documentation/AppKit/NSComboBox/SelectionIsChangingMessage).

---

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