title: How to get the formgroup values and show all of them on parent component
body: <p>I have a reactive form and I'm binding the data from db on the form on ngOninit and also doing the validations for the formcontrols and form array elements.</p>
  <p>I have an another form which contains the same information for review before the submit and I'm able to bind those values in different component using the @Input().</p>
  <p>I want that whenever I change anything on any formcontrol or formarray inside the form then it should reflect on the review form.</p>
  <p>I have tried to subscribe the valueChange event of form in ngOnInit but it never hits whenever I'm changing any control or formarray value.</p>
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  <p>Please help how can I use the valueChange to get all the formcontrols and formarray value on form updated on review form whenever I update anything on the main form.</p>