---
title: NSComboBox.WillPopUpMessage
framework: appkit
role: symbol
role_heading: Structure
path: appkit/nscombobox/willpopupmessage
---

# NSComboBox.WillPopUpMessage

## Declaration

```swift
struct WillPopUpMessage
```

## Topics

### Initializers

- [init(comboBox:)](appkit/nscombobox/willpopupmessage/init(combobox:).md)

### Instance Properties

- [comboBox](appkit/nscombobox/willpopupmessage/combobox.md)

## Relationships

### Conforms To

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