Magritte Chapter in Seaside Book - Missing Method

> Further to my previous posts on this subject, I looked into a Seaside-2.8.4
> image
>  to find that:
>
> 1. The method, asComponent, is in the class Object.
>
>    Object >> asComponent
>     ^self description asComponentOn: self
>
> 2. The method, asComponentOn:, is in the class MAContainer.
>
>    MAContainer >> asComponentOn:
>     ^self componentClass
>        memento: (anObject mementoClass
>                  model: anObject
>                  description: self)
>
> I haven't found these methods in Pharo3/Seaside3/Magritte3.
>
> How are components created from descriptions without them?
>
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