title: How to use FormControl statusChanges in angular2?
body: <p>i am new to angular2 and i want to trigger a function when the user selects some value in a dropDown. So i tried to implement statusChange of the FormControl class but it is not getting triggered,</p>
  <blockquote>
  <p>wonder how and when to use the statusChange in angular2
  this is my code</p>
  </blockquote>
  <pre><code>class policy{
   subCategory: FormControl = new FormControl();
   ngOnInit() {
              this.subCategory.statusChanges.subscribe(
                  s =&gt; {
                      alert('success');
                  }, e =&gt; {
                      alert('error');
                  }, () =&gt; {
                      alert('complete');
                  }
              );
          }
  }
  </code></pre>
  <p>I thought by implementing statusChanges i can trigger the success function on every change of value on the dropdown, obviously it is now working.</p>
  <p><strong>UPDATE 1</strong></p>
  <p>I have updated the <a href="https://plnkr.co/edit/xT2wUrKsy5vZ6lDniLj6?p=info" rel="noreferrer">plunkr</a></p>