You can use below code to get Radio Buttons field in TYPO3 Flex Form :
<label>Radiobuttons</label> <config> <type>radio</type> <items type="array"> <numIndex index="0" type="array"> <numIndex index="0">name1</numIndex> <numIndex index="1">value1</numIndex> </numIndex> <numIndex index="1" type="array"> <numIndex index="0">name2</numIndex> <numIndex index="1">value2</numIndex> </numIndex> <numIndex index="3" type="array"> <numIndex index="0">name3</numIndex> <numIndex index="1">value3</numIndex> </numIndex> </items> </config>


