title: click event not working with input type="radio" in angular 4 bootstrap with ngbButton
body: <pre class="lang-html prettyprint-override"><code>&lt;div class="btn-group" ngbRadioGroup name="radioBasic"[(ngModel)]="model"&gt;
      &lt;label ngbButtonLabel class="btn-primary"&gt;
          &lt;input ngbButton type="radio"  (click)="event1()" /&gt; Birthday
      &lt;/label&gt;
      &lt;label ngbButtonLabel class="btn-primary"&gt;
          &lt;input ngbButton type="radio"  (click)="event2()" /&gt; Birthday &amp; Anniversary
      &lt;/label&gt;
      &lt;label ngbButtonLabel class="btn-primary"&gt;
          &lt;input ngbButton type="radio"  (click)="event3()"/&gt; Anniversary
      &lt;/label&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>In the above code the click is not able to load my function , I also tried with (ngModelChange) and (change) they are also not working</p>