title: Open dropdown based on selected option
body: <p>Currently the <code>onClick</code> method is toggling open class, showing 3 dropdown at one time. </p>
  
  <p>I want to open the dropdown for the selected option, 1 dropdown at a time.</p>
  
  <pre><code>methods: {
          onClick: function(event) {
              this.is_open = !this.is_open;
          }
      }
  </code></pre>
  
  <p><a href="http://jsfiddle.net/bs9Lh73m/" rel="nofollow">http://jsfiddle.net/bs9Lh73m/</a></p>