title: set value in a form builder object in angular
body: <p>I have formbuilder,</p>
  
  <pre><code>gip: any = {
      upper: 460,
      lower: 175
  };
  
  this.demandsForm = this.formBuilder.group({
      gip:[{lower: parseInt(this.gip), upper: parseInt(this.gip)}],
  });
  </code></pre>
  
  <p>I am trying to set value using,</p>
  
  <pre><code>if (this.demands.max_gip != undefined) {
      this.demandsForm.controls['gip']['value']['upper'].setValue(this.demands.max_gip);
  }
  </code></pre>
  
  <p>But I am unable to set the value.</p>