title: How can get widget instance and call functions of widget in dojo2
body: <p>I create a dojo app with following render function.
  ...
      protected render() {</p>
  
  <pre><code>    let zombie = w(Zombie,{}); //zombie has a function walk();
  
      return v('div', [
          v('div',{
              style: "position: relative;height:500px;"
          },[
              zombie
          ])
      ])
  }
  </code></pre>
  
  <p>...</p>
  
  <p>And Zombie widget has a walk function.how and where can I call it from App?  </p>