Xwheelguy, Thanks for the reply, but by untick reference box, i am defining the length of the upper segment, which is not what i want to do..I want to be able to drag the end point of the upper segment and the lower segment will change accordingly.
I am trying to have the length of the lower segment changes as function of the upper segment. I don’t want to constraint the upper segment to any certain value but there’s a relationship I ‘d like to keep.
In the expression tab, I had the lower_length=upper_length+10, the problem is when I...
