use RadioListTile in expansion panels demo (#20240)

* use RadioListTile in expansion panels demo

Fixes #6048.
- expose `_Location`
- appease analyzer
2 files changed
tree: da829978971d951556f663746a2e8964a48a5057
  1. .github/
  2. bin/
  3. dev/
  4. examples/
  5. packages/
  6. .cirrus.yml
  7. .gitattributes
  8. .gitignore
  9. analysis_options.yaml
  10. appveyor.yml
  11. AUTHORS
  12. CONTRIBUTING.md
  13. flutter_console.bat
  14. LICENSE
  15. PATENTS
  16. README.md
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