How to select controls in flow layout panel with auto scroll using mouse like listview?

private Point selectionStart;
        private Point selectionEnd;
        private Rectangle selection;
        private bool mouseDown;

        private void GetSelectedTextBoxes() {

            List<textbox> selected = new List<textbox>();

            foreach (Control c in Controls) {
                if (c is TextBox) {
                    if (selection.IntersectsWith(c.Bounds)) {
                        selected.Add((TextBox)c);
                    }
                }
            }

            // Replace with your input box
            MessageBox.Show("You selected " + selected.Count + 
                            " textbox controls.");
        }

        protected override void OnMouseDown(MouseEventArgs e) {
            selectionStart = PointToClient(MousePosition);
            mouseDown = true;
        }

        protected override void OnMouseUp(MouseEventArgs e) {
            mouseDown = false;

            SetSelectionRect();
            Invalidate();

            GetSelectedTextBoxes();
        }

        protected override void OnMouseMove(MouseEventArgs e) {
            if (!mouseDown) {
                return;
            }

            selectionEnd = PointToClient(MousePosition);
            SetSelectionRect();

            Invalidate();
        }

        protected override void OnPaint(PaintEventArgs e) {
            base.OnPaint(e);

            if (mouseDown) {
                using (Pen pen = new Pen(Color.Black, 1F)) {
                    pen.DashStyle = DashStyle.Dash;
                    e.Graphics.DrawRectangle(pen, selection);
                }
            }
        }

        private void SetSelectionRect() {
            int x, y;
            int width, height;

            x = selectionStart.X > selectionEnd.X ? 
                selectionEnd.X : selectionStart.X;
            y = selectionStart.Y > selectionEnd.Y ? 
                selectionEnd.Y : selectionStart.Y;

            width = selectionStart.X > selectionEnd.X ? 
                    selectionStart.X - selectionEnd.X : 
                    selectionEnd.X - selectionStart.X;
            height = selectionStart.Y > selectionEnd.Y ? 
                     selectionStart.Y - selectionEnd.Y : 
                     selectionEnd.Y - selectionStart.Y;

            selection = new Rectangle(x, y, width, height);
        }
    }