# Sandbox.UI.MixinDefinition.Expand

```csharp
string Expand(Dictionary<string,string> arguments, string contentBlock = null)
```

### Parameters

- `arguments` (`Dictionary<string,string>`)
- `contentBlock` (`string`), default `null`

### Returns

`string`

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