First tree, with root, drag'n'drop and callbacks

Root

Food
- Juice
  - Apple
  - Orange
  - Strawberry
- Meat
Car
- Big
  - Huge
    - Big-foot

Second tree, without root, drag'n'drop and callbacks

Food
- Juice
  - Apple
  - Orange
  - Strawberry
- Meat
Car
- Big
  - Huge
    - Big-foot