System.Windows.Forms.UpDownBase.DownButton C# (CSharp) Method

		public abstract void DownButton ();
		public void Select(int start, int length)

            private void tmrRepeat_Tick(object sender, EventArgs e)
            {
                if (repeat_delay > 1)
                {
                    repeat_counter++;

                    if (repeat_counter < repeat_delay)
                    {
                        return;
                    }

                    repeat_counter = 0;
                    repeat_delay   = (repeat_delay * 3 / 4);
                }

                if (mouse_pressed == 0)
                {
                    tmrRepeat.Enabled = false;
                }

                if ((mouse_pressed == 1) && top_button_rect.Contains(mouse_x, mouse_y))
                {
                    owner.UpButton();
                }

                if ((mouse_pressed == 2) && bottom_button_rect.Contains(mouse_x, mouse_y))
                {
                    owner.DownButton();
                }
            }