From Xojo Documentation
| This item was deprecated in version 2019r2.
Please use TextArea.VerticalScrollPosition as a replacement.
Use to get or set the topmost visible line (zero-based).
Read ScrollPosition to determine the first visible line; write to ScrollPosition to scroll the control. Setting ScrollPosition to the last line or beyond the last line will simply move the vertical scrollbar's thumb to the bottom, not necessarily displaying the last line at the top of the control.