[Pharo-users] leansleft problem

[Roelof Wobben]

If I understood everything well on page 26 my Cell initialize must look 
like this:

initialize
    super initialize.
    self initializeActiveSegments.
    self initializeExitSides.
    self leanleft.
The Blankcell initialize must look like this :

initialize
    super initialize.
    self initializeExitSides.

And the MirrorCell initialize must look like this :

initialize
    super initialize
    self leansLeft: true

Why then I see a message that leanleft is not Understood in Blankcell.
or do I misunderstood that page. I find it a very confusing page.

Roelof