1. Constructors
2. new
3. Properties
4. acceptLabel
5. hashCode
6. header
7. icon
8. key
9. message
10. onAccept
11. onReject
12. rejectLabel
13. runtimeType
14. variant
15. Methods
16. asFocusable ^(ext)
17. asSemanticButton ^(ext)
18. asSemanticHeading ^(ext)
19. build
20. createElement
21. debugDescribeChildren
22. debugFillProperties
23. excludeFromSemantics ^(ext)
24. mergeSemantics ^(ext)
25. noSuchMethod
26. toDiagnosticsNode
27. toString
28. toStringDeep
29. toStringShallow
30. toStringShort
31. withSemanticLabel ^(ext)
32. Operators
33. operator ==