<div id="app">
<div>
        <form-wizard @on-complete="onComplete"
                      shape="square"
                      layout="vertical"
                      steps-classes="steps-size"
                      color="#3498db">
            <tab-content title="Personal details"
                         icon="ti-user" v-if="t2=='y'">
              My first tab content
            </tab-content>
            <tab-content title="Additional Info"
                         icon="ti-settings" v-if="t3=='y'">
              My second tab content
            </tab-content>
            <tab-content title="Last step"
                         icon="ti-check">
              Yuhuuu! This seems pretty damn simple
            </tab-content>
        </form-wizard>
 </div>
</div>

Vue.use(VueFormWizard)
new Vue({
 el: '#app',
 data(){return{
 t1:'y',
 t2:'y',
 t3:'y',
 }

 },
 created:{
 //this.t2='y',
 },
 methods: {
  onComplete: function(){
      alert('Yay. Done!');
   }
  }
})