From Xojo Documentation
| This item was deprecated in version 2019r2.
Please use Slider.TickMarkStyles as a replacement.
Used to set the TickStyle property of a Slider control.
The TickStyles enum has the following values:
The value of TopLeft places tick marks above a horizontal Slider and to the left of a vertical Slider. The value of BottomRight places the tick marks below a horizontal Slider and to the right of a vertical one. TickStyle is a design-time only property of a Slider.
This example is in the Open event of the Slider. It sets the TickStyle to Bottom Right.