login.html

<v-panel>
<v-vertical-layout margin spacing>
    <v-label><h3>Sign In</h3></v-label>
    <v-horizontal-layout spacing>
        <v-text-field caption="Email" />
        <v-password-field caption="Password" />
    </v-horizontal-layout>
    <v-button style-name="primary">Sign In</v-button>
</v-vertical-layout>
</v-panel>

login.json

{  
   "component":"v-panel",
   "children":[  
      {  
         "component":"v-vertical-layout",
         "margin":true,
         "spacing":true,
         "children":[  
            {  
               "component":"v-label",
               "value":"<h3>Sign In</h3>"
            },
            {  
               "component":"v-horizontal-layout",
               "spacing":true,
               "children":[  
                  {  
                     "component":"v-text-field",
                     "caption":"Email"
                  },
                  {  
                     "component":"v-password-field",
                     "caption":"Password"
                  }
               ]
            },
            {  
               "component":"v-button",
               "style-name":"primary",
               "value":"Sign In"
            }
         ]
      }
   ]
}