# Sandbox.MovieMaker.Properties.Unknown

Dummy type for [Sandbox.MovieMaker.Properties.ITrackPropertyFactory<TParent>](/api/Sandbox.MovieMaker.Properties.ITrackPropertyFactory<TParent>) to return if it matches
a track, but doesn't know what target type it maps to.

- Kind: class
- Namespace: `Sandbox.MovieMaker.Properties`
- Assembly: `Sandbox.Engine`
- Modifiers: abstract