# headerContextMenuPopulateEvent

> If a column is right-clicked to show context menu options, this event is raised to allow users to change the available options.

## Definition

* **Type:** Event
* **Namespace:** [UnityEngine.UIElements](/engine/6000.5/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

```csharp
public event Action<ContextualMenuPopulateEvent, Column> headerContextMenuPopulateEvent
```