<template>
  <div id="containerPrincipal" @click.stop="teste">
 ...
<template>

<script>
 /*Outro componente*/
 import flex_div from './elementos/Div.vue'

 export default {
  name: 'containerPrincipal',
  methods : {
   teste () {
      componente = new flex_div().$mount();
      console.log(componente);
   }
  },
  components: {
   flex_div
  }
 }
</script>