# Sandbox.UI.PanelRenderTreeBuilder.AddAttribute

```csharp
void AddAttribute(int sequence, System.Action<T> value)
```

### Parameters

- `sequence` (`int`)
- `value` (`System.Action<T>`)

Declared in [Sandbox.UI.PanelRenderTreeBuilder](/api/Sandbox.UI.PanelRenderTreeBuilder).
Assembly: `Sandbox.Engine`.