Great thanks for your reply.
There is so much tutorials it´s true that i haven't test this one. I'll try to test it and send my feedback to others who have the same problem (i'm sure there s a lot infortunately).
Construct 2 is a great software for creation but it s quite difficult - in my opinion of course - to understand how to really make a professionnal job with it :-/
Hope this tutorial can help me.
Thanks a lot