[Seaside] Magritte Chapter in Seaside Book - Missing Method

[Bruce Prior]

On page 360 in the Seaside book, near bottom of page, a method, 
asComponent, is used.

I can't find that method in my image. I'm running Pharo3, Magritte3 and 
Seaside3.1.

Has asComponent been replaced with something else?
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