thanks Mart,
in this case, the xy graph is changed to control condition (normally it is in indicator condition). i will use mouse to draw the circle, line.. on this xy graph. but i can not draw with this case.
if i can draw, next step i will get thes data of thi\ese circles, lines.. analysis them and export to stepper motors to make the model moving in 2d axis.
sincerely,
Tung