• Item1
    • Sub Item1
    • Sub Item2
      • Sub Sub Item1
      • Sub Sub Item2
    • Sub Item3
    • Sub Item4
      • Sub Sub Item1
      • Sub Sub Item2
  • Item2 caption
  • Item3 caption
  • Item4
    • Yep, collapsible items can have any content.

      Even input elements like input/text
      and input/hslider: . Later one has this element x as a "buddy".