System.Windows.Forms.TreeView.OnMouseDoubleClick C# (CSharp) Method

        protected override void OnMouseDoubleClick(MouseEventArgs e)
        {
            var sNode = _SelectAtPosition(e);
            if (sNode != null)
            {
                sNode.Toggle();
                NodeMouseDoubleClick(this, new TreeNodeMouseClickEventArgs(sNode, e.Button, e.Clicks, e.X, e.Y));
            }
        }
        protected override void OnMouseDown(MouseEventArgs e)