1. Constructors
2. new
3. Properties
4. hashCode
5. hasListeners
6. isExpanded
7. runtimeType
8. Methods
9. addListener
10. collapse
11. dispose
12. expand
13. noSuchMethod
14. notifyListeners
15. removeListener
16. toString
17. Operators
18. operator ==
19. Static methods
20. maybeOf
21. of