FairyGUI.GObject.StartDrag C# (CSharp) Method

        public void StartDrag()
        {
            StartDrag(-1);
        }

 public void StartDrag(int touchPointID = -1)
 {
     dropTarget       = false;
     mAgent.touchable = false;
     mAgent.visible   = true;
     mAgent.xy        = mAgent.parent.GlobalToLocal(Stage.inst.GetTouchPosition(touchPointID));
     mAgent.StartDrag(touchPointID);
 }