# TreeListControlBase.NodeExpanded event

Occurs after a node is expanded.

```csharp
public event EventHandler<TreeListNodeEventArgs>? NodeExpanded;
```

## See Also

* class [TreeListNodeEventArgs](../TreeListNodeEventArgs.md)
* class [TreeListControlBase](../TreeListControlBase.md)
* namespace [Eremex.AvaloniaUI.Controls.TreeList](../index.md)

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