System.Windows.Forms.TableView.TableColumnButton.OnMouseDown C# (CSharp) Method

            protected override void OnMouseDown(MouseEventArgs e)
            {
                base.OnMouseDown(e);

                switch (e.Button)
                {
                    case MouseButtons.Left:
                        if (resizeType != resizeTypes.None)
                        {
                            resizing = true;
                            resizeStartMouseLocation = PointToScreen(e.Location);
                            resizeStartLocation = Location;
                            resizeStartWidth = Width;

                            // Find prev button.
                            var table = Parent as TableView;
                            var button = table.topLeftButton;
                            if (column.Index > 0)
                                button = table.Columns[column.Index - 1].control as TableColumnButton;
                            prevButton = button;
                        }
                        break;
                }
            }
            protected override void OnMouseHover(EventArgs e)