1. accordion
2. accordion
3. ListController
4. openSections property

##### ListController class

1. Constructors
2. ListController
3. Properties
4. controller
5. hashCode
6. hasListeners
7. initialized
8. initialOpeningSequenceDelay
9. isClosed
10. listeners
11. maxOpenSections
12. onDelete
13. onStart
14. openSections
15. runtimeType
16. Methods
17. $configureLifeCycle
18. addListener
19. addListenerId
20. dispose
21. disposeId
22. noSuchMethod
23. notifyChildrens
24. onClose
25. onInit
26. onReady
27. refresh
28. refreshGroup
29. removeListener
30. removeListenerId
31. toString
32. update
33. updateSections
34. Operators
35. operator ==

# openSections property Null safety

RxList<UniqueKey> openSections
final

## Implementation

    final openSections = <UniqueKey>[].obs;