The null-values in the line works as I wish. However a box appears around my charts with null-values.
I can’t reproduce them in your examples.
When testing in my charts, I found that the first chartline whith a userdefined color defines the color of the box.
You can see the box in http://www.kostennetaansluiting.nl/TenneT.php.
How can I disable the box?
For the record: The visible-event works great.
With kind regards,