# TreeListControl.CustomSummary event

Occurs when a summary item with the Custom summary type is calculated.

```csharp
public event EventHandler<TreeListCustomSummaryEventArgs>? CustomSummary;
```

## See Also

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

<!-- DO NOT EDIT: generated by xmldocmd for Eremex.Avalonia.Controls.dll -->