title: Add validation in the child component (Reactive Forms)
body: <p>In the above Demo , I have built a reactive form with the input field inside a child component.I am trying to add new form control inside the child component and validate it inside the component itself.I am getting the following error.</p>
  
  <blockquote>
    <p>Error: Cannot read property 'errors' of undefined</p>
  </blockquote>
  
  <p>I am not sure what is the error and very new to the Reactive Forms.In Brief what i am trying to do is,</p>
  
  <ul>
  <li>Append new control to the parent form group from the child component</li>
  <li>Validation of the newly added control should be done inside the child component itself</li>
  </ul>