title: Angular2: Error - Property 'updateValue' does not exist on type 'AbstractControl'
body: <p>I've created a <strong>ControlGroup</strong> <code>theForm</code> using <strong>FormBuilder</strong>.</p>
  
  <p>When I tried to update value of a control like this </p>
  
  <p><code>this.theForm.find('MainImageId').updateValue( id, true, true);</code></p>
  
  <p>It worked fine but WebStorm shows an error saying</p>
  
  <p><code>Error:(148, 24) TS2339: Property 'updateValue' does not exist on type 'AbstractControl'.</code></p>
  
  <p>What am I doing wrong? and why does it work?</p>