i can't see exemple.capx because of my C2 version for now (i will check it as soon as i update my C2) but i think my problem is now solved. je te remercie kyatric, and thank you too ramones, for your patience and effort.
i was desperately trying to set instance variables of non existing objects (i am saying non existing because these objects are being created when game starts, i am using an array to create them on start of layout) but all i have to do is to use these CELLs of course.
sorry :)