# Sandbox.UI.Panel.OnRenderFragmentChanged

```csharp
void OnRenderFragmentChanged(Panel upTo)
```

A RenderFragment has been set on us, so our tree has potential changes now.
Lets update and see.

### Parameters

- `upTo` (`Panel`)

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