AdvancedPageDragAndDrop.PageDragTreeView.OnMouseUp C# (CSharp) Метод

        protected override void OnMouseUp(MouseEventArgs e)
        {
            if (_dragging)
            {
                if (e.Button == MouseButtons.Left)
                    PageDragEnd(new Point(e.X, e.Y));
                else
                    PageDragQuit();
            }

            // Any released mouse menas we have ended drag monitoring
            _dragNode = null;

            base.OnMouseUp(e);
        }