[Pharo-users] leansleft problem

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