#33 List format grouping does not work properly

[Andrew Barnham]

As summary implies. System will not render list format sub groups. Swing JTable does not support them I think so represents some effort to implement.

[Andrew Barnham]

See example via google search:
http://www.java2s.com/Code/Java/Swing-Components/GroupableGroupHeaderExample.htm

Looks like someone already done hard work. Just need to copy/paste their code and wire it into c9 :)