# TreeListControl.CustomUnboundColumnData event

Occurs when a cell value of an unbound column is requested or posted.

```csharp
public event EventHandler<TreeListUnboundColumnDataEventArgs>? CustomUnboundColumnData;
```

## See Also

* class [TreeListUnboundColumnDataEventArgs](../TreeListUnboundColumnDataEventArgs.md)
* class [TreeListControl](../TreeListControl.md)
* namespace [Eremex.AvaloniaUI.Controls.TreeList](../index.md)

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