---
title: NSOutlineView.ItemWillExpandMessage
framework: appkit
role: symbol
role_heading: Structure
path: appkit/nsoutlineview/itemwillexpandmessage
---

# NSOutlineView.ItemWillExpandMessage

## Declaration

```swift
struct ItemWillExpandMessage
```

## Topics

### Initializers

- [init(outlineView:item:)](appkit/nsoutlineview/itemwillexpandmessage/init(outlineview:item:).md)

### Instance Properties

- [item](appkit/nsoutlineview/itemwillexpandmessage/item.md)
- [outlineView](appkit/nsoutlineview/itemwillexpandmessage/outlineview.md)

## Relationships

### Conforms To

- [Copyable](swift/copyable.md)
- [Escapable](swift/escapable.md)
- [NotificationCenter.MainActorMessage](foundation/notificationcenter/mainactormessage.md)
- [SendableMetatype](swift/sendablemetatype.md)