title: V-for clicks all buttons instead of just one
body: <p>I am new to Vue.js. I am trying to render check boxes from v-for (which renders correctly) based on an array.</p>
  
  <p>Then I try to render a button beside each check box which opens a multi-select based on the selected index. But every time I click the rendered button, it opens up the multi select across all the checkbox buttons.</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;div&gt;
    &lt;label class='label'&gt;countrys:* &lt;/label&gt;&lt;br&gt;&lt;br&gt;
    &lt;div 
      v-for="(country, index) in countries" 
      class="label" 
      style="display: inline-block;"&gt;
      &lt;input 
        type='checkbox' 
        value="country"&gt;&amp;nbsp
      {{country.geos}} &amp;nbsp&amp;nbsp&amp;nbsp&amp;nbsp&amp;nbsp&amp;nbsp&amp;nbsp
      &lt;img 
        class='addIcon' 
        v-bind="country" 
        :key="country.index" 
        style="width: 26px;height: 20px;margin-right: 8px;margin-top: px;margin-left: -25px;margin-bottom:-5px"
        src='../../images/createScreen/addClient@2x.png' 
        @click="makeMarketsActive($event, index)"&gt;
      &lt;select multiple v-if="!isHidden"&gt;
        &lt;option 
          v-for="(market) in country.markets" 
          v-bind="country"&gt;
          {{ market }}
        &lt;/option&gt;
      &lt;/select&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>JS:</p>
  
  <pre><code>export default {
    name: "Update",
    components: {
    },
    data() {
      return {    
        countries:[
          {
            "index":0,
            "geos":"America",
            "markets":['a','b','c','d']
          },
          {
            "index":1,
            "geos":"Canada",
            "markets":['a','b']
           },
             "index":2,
             "geos":"Africa",
             "markets":['x','z']
           }
        ],
        isHidden:true
      }
    },
    makeMarketsActive(event, index) {
      this.isHidden = !this.isHidden;
    }
  </code></pre>
  
  <p>Expected result : When clicking the image rendered for each checkbox I just want to see the market for each geo and not for all.</p>