# UnbindColumn

> Callback triggered when the column is about to be destroyed.

## Definition

* **Type:** Field
* **Namespace:** [Unity.Hierarchy](/engine/6000.7/script-reference/unity/hierarchy.md)
* **Assembly:** UnityEngine.HierarchyModule

```csharp
public Action<HierarchyViewColumn, HierarchyView> UnbindColumn
```