Here\'s the fiddle, the type is radio but acts like check-box
radio
check-box
{type: \'radio\', name: \'letter\', label: \'Letter\'}, {type: \'radio\
It seems like the tinymce/ui/Radio class is not implemented yet. It act like a tinymce/ui/Checkbox.
tinymce/ui/Radio
tinymce/ui/Checkbox
You can use the tinymce/ui/ListBox class as a workaround.
tinymce/ui/ListBox