# Sandbox.UI.Panel.OnTemplateSlot

```csharp
void OnTemplateSlot(INode element, string slotName, Panel panel)
```

Called when a child created from razor markup has a `slot` attribute. Walks up the
hierarchy until a panel claims the slot.

### Parameters

- `element` (`INode`)
- `slotName` (`string`)
- `panel` (`Panel`)

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