Yes!!! It was the "move tool" ! That rocks! THx!
Another time no think to take a "tool" for move a point, thinking that mouse's moves (or Pen's moves:) were sufficent !

Another little thing :)
That is a tangente with the last point of control "out" the curve
Is it the same tangent than a point who will be near the extremity and the extremity but "on" the curve?
Seems yes, but I ask the question :)