title: How do I get the value of a nested formBuilder group
body: <p>My nested form is currently formatted in this way: </p>
  
  <pre><code>this.form = this.formBuilder.group({
        user:  this.formBuilder.group({
          id: ['', Validators.required],
          name: ['', Validators.required],
          phone: ['', Validators.required]
        })
  })
  </code></pre>
  
  <p>I would usually access the value like this: </p>
  
  <pre><code>let userID = this.Form.controls['id'].value;
  let userName = this.Form.controls['name'].value;
  let userPhone = this.Form.controls['phone'].value;
  </code></pre>
  
  <p>but because the formGroups are nested, I'm not sure how to access the nested values. I tried:</p>
  
  <pre><code>let userName = this.Form.controls['user'].name;
  </code></pre>
  
  <p>What's the correct syntax for accessing a form control value in a nested formGroup? Thanks</p>