System.Windows.Forms.TreeView_Old.OnMouseUp C# (CSharp) Method

        protected override void OnMouseUp(MouseEventArgs e)
        {
            base.OnMouseUp(e);
            _scroll = false;
            _drag = false;

            var mclient = PointToClient(MousePosition);
            for (int i = 0; i < _renderList.Count; i++)
            {
                Rectangle nodeRect = new Rectangle(0, i * NodeHeight, Width - _scrollWidth, NodeHeight);
                if (nodeRect.Contains(mclient))
                {
                    _renderList[i].Node.OnClickCall(e, _renderList[i].Node);
                    return;
                }
            }

            _selectedIndex = -1;
        }
        protected override void OnMouseWheel(MouseEventArgs e)