Thank for your answer Chris.
 I'm a newbie and I just start to learn what is a class and attributes. But 
when I read your tex I restart the shell and I create a new object and it works.
Your message helps me and I think I create the object tab with self surface and 
then I modified my TableauNoir Class . But I did not know that an object could 
be old but it sounds very logical when you heard it.
Anyway I think your crystal ball works well ...:-)

P.S : sorry for my english. I'm french.....
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