Yes, it is possible to change the gender identity of transgender. IMHO.
However, many feel that to perform the surgery - a much easier and faster. Why?
Try to agree to the request of the child to buy a Kinder Surprise, or to explain to him that it was - a waste of money that chocolate in the candy - not very high quality, and the cost is obviously overestimated!

The first - a lot easier.
So many and go that way.