an example can be found on AMOSPro_Examples:Examples/H-3/Help_33.AMOS
Draws a vertical slider bar on the screen.
Vslider tx,ty To bx,by,total,pos,size
total sets the number of units the bar is divided into.
pos specifies the position of the slider box relative to the start of the bar, in the units you've entered in total.
size fixes the size of the slider box.