Slider: tick marks are not drawn correctly for vertical Sliders

When a Slider is set for vertical orientation, the wrong number of tick marks are drawn, and/or the tick marks are drawn in the wrong locations. In the attached code, the horizontal Slider is drawn with 11 tick marks, but the otherwise identical vertical version is drawn with six. When applying the SliderStyle taken from the documentation, a single tick is drawn far to the right of the Slider.