<div id="{{id}}" class="app window-app {{classes}} this-is-my-custom-window" data-appid="{{appId}}">
  <header class="window-header flexrow">
      <h4 class="window-title">{{title}}</h4>
      {{#each headerButtons}}
      <a class="header-button {{this.class}}"><i class="{{this.icon}}"></i></a>
      {{/each}}
  </header>

  <section class="window-content">
  </section>
</div>