title: How to get :id param of child route from parent component in Angular2
body: <p>I'm trying to get the <code>:id</code> param defined in </p>
  
  <pre class="lang-ts prettyprint-override"><code>RouterModule.forRoot([
    {
      path: 'orders',
      component: ListComponent,
      children: [
        {
          path: 'view/:id',
          component: ViewComponent
        },
      ]
    }
  ])
  </code></pre>
  
  <p>from <code>ListComponent</code>.</p>
  
  <p>I already tried:</p>
  
  <pre class="lang-ts prettyprint-override"><code>route: ActivatedRoute
  
  route.params.subscribe(params =&gt; {
    let id = +params['id'];
  })
  </code></pre>
  
  <p>from <code>ListComponent</code>, but the <code>params</code> array is empty, I suppose it's because the <code>:id</code> param belongs to <code>ViewComponent</code> not <code>ListComponent</code>.</p>
  
  <p>How can I get the <code>id</code> param in <code>ListComponent</code>?</p>