ur using da wrong commands
2 set marker color u need da
setMArkerColor comand (in ur case "obj3" setmarkercolor "ColorRed"
2 set maerk size u need da
setmarkersize comand (in ur case "obj3" setmarkersize [100,100])
2 set da marker to other shape u need da
setMarkerShape comand (in ur case "obj3" setmarkershape "ELLIPSE")
2 set da markers fill u need da
setMarkerBrush comand (in ur case i dont realy know wat dey call da cross fill but ill guess dat "obj3" setmarkerbrush "cross" or somin of da like)
LCD OUT