# Sandbox.UI.LengthUnitExtension

- Kind: class
- Namespace: `Sandbox.UI`
- Assembly: `Sandbox.System`
- Modifiers: static, abstract, sealed, extension

## Methods

- [`IsDynamic`](/api/Sandbox.UI.LengthUnitExtension/IsDynamic): Determine whether this unit type is dynamic (ie. should be updated regularly) or whether it's constant