title: vuetify change tab event
body: <p>I use v-tabs and I want to know: how can i know about tab id, when I change a tab?
  this is my code:</p>
  
  <pre><code> &lt;v-tabs class="tabs-container" color="green" grow&gt;
          &lt;v-tab class="tab"
                 v-for="tab of tabs"
                 :key="tab.id"
                 :title=tab&gt;
              {{tab.name}}
          &lt;/v-tab&gt;
          &lt;v-tabs-items&gt;
          &lt;v-tab-item v-for="tab in tabs" :key="tab.id"&gt;
              &lt;div v-if='tab.id == 0'&gt;
                  &lt;CreateHero v-on:updateAllTabs="updateAllTabs"/&gt;
              &lt;/div&gt;
              &lt;div v-else&gt;
                  &lt;HeroPresenter/&gt;
              &lt;/div&gt;
          &lt;/v-tab-item&gt;
          &lt;/v-tabs-items&gt;
      &lt;/v-tabs&gt;
  
  ...
      methods: {
              updateAllTabs() {
                  axios.get('/hero').then(responce =&gt; {
                      this.tabs = responce.data
                  })
              },
              getHero(id) {
                  this.$emit("getCurrentHero", id);
              }
          }
  </code></pre>
  
  <p>so, when a click to tab, I want to send tab id in the HeroPresenter component. I tried to use $emit, but what should I write in v-tab?? My vue-component HeroPresenter was subscribed on "getCurrentHero"</p>