Angular 2:无法让formGroup与单选按钮一起工作

<form [formGroup]="myForm">
  <!-- 单选按钮 -->
</form>

import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup } from '@angular/forms';

@Component({
  selector: 'app-my-component',
  templateUrl: './my-component.component.html',
  styleUrls: ['./my-component.component.css']
})
export class MyComponentComponent implements OnInit {
  myForm: FormGroup;

  constructor(private formBuilder: FormBuilder) { }

  ngOnInit() {
    this.myForm = this.formBuilder.group({
      // 表单控件
    });
  }
}

<form [formGroup]="myForm">
  <label>
    <input type="radio" formControlName="option" value="option1"> Option 1
  </label>
  <label>
    <input type="radio" formControlName="option" value="option2"> Option 2
  </label>
</form>

// 获取选中的单选按钮的值
const selectedOption = this.myForm.value.option;