AMOSi:Priority Reverse On
an example can be found on AMOSPro_Examples:Examples/H-3/Help_30.AMOS
Activates the REVERSE effect of the PRIORITY command for the display of Bobs on screen. PRIORITY REVERSE OFF is the normal mode, but by turning it ON Bobs with the lowest y coordinates will appear in front of those with higher y coordinates.
Priority Reverse On