Example tree widget:

• Books
  • the prose currently showin
  • David Weber
    • In Fury Born
    • The Excalibur Alternative
    • Honor Harrington
      • On Basilisk Station
      • The Honor of the Queen
  • The Art of War
• Music
  • Jingle Bells
  • Joy to the World
• Videos
  • Singing in the Rain
  • Mary Poppins