<window apply="pkg$.TestComposer">

    <div>

      Start date: <datebox id="startDatebox" />

    </div>

    <div>

      End date: <datebox id="endDatebox" />

    </div>

    <div>

      <button id="button" label="Send" />

    </div>

    <div>

      <label id="output" pre="true" />

    </div>

  </window>

</zk>

​