title: Vuetify.js: v-dialog is not working when i close and open again
body: <p>I using a Vuetify.js for my project
  when I used v-dialog component I got a problem that closing the v-dialog and open again.</p>
  <p>here is my code.</p>
  <p><code>&lt;div @click=&quot;dialog=true&quot;&gt;click here&lt;/div&gt;</code></p>
  <pre><code>&lt;v-dialog v-model=&quot;dialog&quot;&gt;
      &lt;alert-popup /&gt;
  &lt;/v-dialog&gt;
  
  
  data() {
  return {
    dialog : false
   }
  </code></pre>
  <p>this is work when I open dialog first time but when I open again only can see the opacity black page
  I don`t know which part is wrong.  please reply this question. thanks</p>