> If I move the curve, actually I click on the curve and it seems
> to move the data points, then I can change the line
> thickness/color
To simplify things I would advice to select "Status Bar" option
from the drop-down menu. This will should you what kind of the object
the mouse is crossing. Just you realize the mouse is becoming in
touch with very your object - click "RIGHT" mouse button to generate
the "context menu".
Valery