Add code coverage for RadioButtonPopupAdapter#13725

Zheng-Li01 wants to merge 1 commit intodotnet:maindotnet/winforms:mainfrom

Zheng-Li01:Add_code_coverage_for_TestRadioButtonPopupAdapterZheng-Li01/winforms:Add_code_coverage_for_TestRadioButtonPopupAdapterCopy head branch name to clipboard