---
title: NSPopUpButtonCell.WillPopUpMessage
framework: appkit
role: symbol
role_heading: Structure
path: appkit/nspopupbuttoncell/willpopupmessage
---

# NSPopUpButtonCell.WillPopUpMessage

## Declaration

```swift
struct WillPopUpMessage
```

## Topics

### Initializers

- [init(popUpButtonCell:)](appkit/nspopupbuttoncell/willpopupmessage/init(popupbuttoncell:).md)

### Instance Properties

- [popUpButtonCell](appkit/nspopupbuttoncell/willpopupmessage/popupbuttoncell.md)

## Relationships

### Conforms To

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