# Sandbox.UI.MixinParameter

A single parameter in a mixin definition.

- Kind: struct
- Namespace: `Sandbox.UI`
- Assembly: `Sandbox.Engine`
- Modifiers: sealed

## Constructors

- [`MixinParameter`](/api/Sandbox.UI.MixinParameter/.ctor): A single parameter in a mixin definition.

## Fields

- [`DefaultValue`](/api/Sandbox.UI.MixinParameter/DefaultValue): Default value, or null if the parameter is required
- [`IsVariadic`](/api/Sandbox.UI.MixinParameter/IsVariadic): Whether this is a variadic parameter (collects remaining arguments)
- [`Name`](/api/Sandbox.UI.MixinParameter/Name): Parameter name without the $ prefix (and without ... for variadic)