Directive not shown inside ui-view

Given the current setup:

```
<body ng-app="app">
    <div ui-view=""></div>
</div>
```

And including the `<mc-messages></mc-messages>` directive inside the view, it will only show if the directive is also included outside the view, as such:

```
<body ng-app="app">
    <div style="display: none" mc-messages></div>
    <div ui-view=""></div>
</div>
```

Why is this happening?
