focus () {
      const rootRef = this.$refs.radioGroup.$el
      rootRef.focus = () => {
        let input = rootRef.querySelector(
          'input:not(:disabled):checked'
        )

        if (!input) {
          input = rootRef.querySelector('input:not(:disabled)')
        }

        if (input) {
          this.$nextTick(() => {
            input.focus()
          })
        }
      }
    }
Focuses the selected option or first enabled option