如何在@ViewChild Angular2中查找子元素？

import { Component,ViewChild } from '@angular/core';

@Component({
  SELEctor: 'my-app',template: `
    <div #container>
        <p>para 1</p>
        <p>para 2</p>
        <button>button 1</button>
    </div>
  `
})
export class AppComponent {
  @ViewChild('container') myDiv;

  ngAfterViewInit(){
    //this console.log would print this [p,p,button]
    console.log(this.myDiv.nativeElement.children);
    //how can I access to only p nativeElement only? 
  } 

}

见plunker