Suffix -ce,I saw it a lot of time,but I still don´t know what´s that.
I guess it´s that suffix,I´m not sure,but you are probably yes
Example:
Büyüyünce ne olmak istiyorsun?
.. If there is alrealdy this topic,just send me the link,or some website,I didn´t found anything .. 

Büyüyünce = Büyüdüğün zaman = When you grow up...

The adverbial clause with -IncA denotes an action slightly prior to the main verb. One of the many ways to say ´when´.

http://www.turkishclass.com/forumTitle_54244

http://www.turkishlanguage.co.uk/avctime.htm

Büyü-(y)-ünce
There are four possible forms of this suffix: -ınca, -ince, -unca, -ünce

...and this adverbial verb form doesn´t actually show the person at all. So, in your sentence

                      Büyüyünce ne olmak istiyorsun?

the person, sg 2nd, shows only in the main verb. Thus, the pl 1st person for example would be

                      Büyüyünce ne olmak istiyoruz?

This feature, following the main clause predicate in person and number, is typical to adverbial clauses. But read more in the links.

I see.. I alrelady read that.. I think that I understand that pretty much good..  Thank you.
I have to ask this: Why is büyüYünce,and not with Ğ. What´s difference between that? But,it looks so much better with Y,I have to agree.  

Because it comes from the verb stem büyü-, not from the adjective büyük. Where can you get the ğ from when there is no k in the first place, eh?

I didn´t know that verb stem is büyü-,ehh. :