title: Angular formarray push formgroup
body: <p>Showing me error "TypeError: control.setParent is not a function" every time when try something like this....goal is to get answers('odgovori' FormArray) but not to loop on input but in radio group... than user select radio button as correct answer and store all. When do:</p>
  
  <pre><code>console.log(this.odgovorForm.value)
  </code></pre>
  
  <p>everything show ok but when push then show error</p>
  
  <pre><code>get odgovori() {
      return this.pitanjeForm.get('odgovori') as FormArray;
    }
  
   pitanjeForm = this.fb.group({
      data: ['', [Validators.required]],
      odgovori: this.fb.array([]),
      tacan: ['', [Validators.required]]
    });
  
    odgovorForm = this.fb.group({
      data: ['', [Validators.required]],
      color: 'danger'
    });
  
    addAnswer(): void {
      console.log(this.pitanjeForm.value, this.odgovorForm.value);
      this.info = this.odgovorForm.value;
      this.odgovori.push(this.info);
    }
  </code></pre>
  
  <p>HTML</p>
  
  <pre><code>&lt;form [formGroup]="pitanjeForm"&gt;
   &lt;div&gt;
     &lt;input formControlName="data"&gt;
   &lt;/div&gt;
    &lt;form [formGroup]="odgovorForm"&gt;
      &lt;input formControlName="data"&gt;
      &lt;button (click)="addAnswer()"&gt;&lt;/button&gt;
    &lt;/form&gt;
   &lt;div *ngFor="let odgovor of odgovor.value; index as i"&gt;
     &lt;input type="radio" value="{{ i }}"&gt; 0 - 30&lt;br&gt;
   &lt;/div&gt;
  &lt;/form&gt;
  </code></pre>