[Seaside] Using canvas ?

[Hilaire Fernandes]

 From a a sub WACompondent with

renderContentOn: html
	html anchor callback: [self addTeacher]; text: 'ajouter'

I go the error:
MessageNotUnderstood: UndefinedObject>>isGet

It is with 2.6b

Do I need to set up something to use the canvas system?

By the canvas/tag API really looks clearer to browse and read.

Hilaire