Dan
I would love it if the Panel Header worked with Collapsible Panel. Best I can tell it does not.
SPARK Support
Hi Dan,
You are correct. The Collapsible Panel has mechanism located where the Panel Header would appear in a Panel Section. I have updated the Panel Header article to note this issue, and I have logged a Feature Request to be evaluated for inclusion into an upcoming release. Thank you for bringing this to our attention.
Regards,
Stephen P.