NG2- Model Change in Selection - Drop down box

NG2- Model Change in Selection - Drop down box:
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Ref: https://plnkr.co/edit/oFADUI?p=preview


//our root app component
import {Component, Directive, Output, EventEmitter, Input, SimpleChange} from 'angular2/core'
import {Observable} from 'rxjs/Observable';
import {Observer} from 'rxjs/Observer';
//import 'rxjs/Rx';


@Component({
    selector: 'my-app',
    template: `
    <h1>Hello</h1>
<select class="form-control" [(ngModel)]="selectedPrototypeSelector" (ngModelChange)="onPrototypeChange()">
   <option *ngFor="let p of prototypes" [ngValue]="p">
         {{ p.id }}
   </option>
</select>
<div>selected: {{selectedPrototypeSelector.id}}</div>
    `,
})
export class AppComponent {
  selectedPrototypeSelector;
  prototypes = [{id: 'a'}, {id: 'b'}, {id: 'c'}];
 
  constructor() {
    this.selectedPrototypeSelector = this.prototypes[1];
  }
 
  onPrototypeChange() {
    console.debug(this.selectedPrototypeSelector);
  }
}