title: How to focus v-radio-group selected radio programmatically?
body: <p>How to focus v-radio-group selected radio programmatically ?</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;v-radio-group v-model="radios" :mandatory="false" ref="RadioGroup"&gt;
    &lt;v-radio label="Radio 1" value="radio-1"&gt;&lt;/v-radio&gt;
    &lt;v-radio label="Radio 2" value="radio-2"&gt;&lt;/v-radio&gt;
  &lt;/v-radio-group&gt;
  </code></pre>
  
  <p>I tried with <code>this.$refs.RadioGroup.focus()</code> but nothing happens.
  Thank you in advance</p>