title: Angular2 recursive tree expand all
body: <p>I have recursive tree component and I would like to expand all nodes on click from parent component, how can I do this? More details in plunker.</p>
  
  <p><a href="https://plnkr.co/edit/5Q5obfcW1mhsYe9jFXZo?p=preview" rel="nofollow">Plunker</a></p>
  
  <p>I talking about this method:</p>
  
  <pre><code>   expandAll(){
      console.log("expanded all");
    }
  </code></pre>