to create a button in pdf don t use :
getAnnots3D(this.pageNum)[0].BringMyChildrenBack("NameOfTheNode");
getAnnots3D(this.pageNum)[0].HideUnhide();
but :
getAnnots3D(this.pageNum)[0].context3D.BringMyChildrenBack("NameOfTheNode");
getAnnots3D(this.pageNum)[0].context3D.HideUnhide();