Add EditorUtility.OpenPropertySheet https://files.facepunch.com/garry/c9f2b5cb-f6bb-4895-a401-346d1dbf939c.png Set qt darkmode=2 so windows will follow system theme (I think) Add ControlObjectWidget Add [KeyProperty] Add KeyProperty to TextureSequence.Source ControlWidget will create an editor for unknown types (this will likely need locking down)