JqueryMobile listview Scrollbar is not displaying in Phonegap

Question

I am developing an android application using JqueryMobile with Phonegap. I created a page containing an unordered list.

<div id='pg_remote-address-book' data-role="page"> 
  <div data-role="content" id="pg_remote-address-book_content" data-scroll="true">
    <ul data-role="listview" id="ul_address_list">
    </ul>
  </div>
</div> 

I am loading the listitems dynamically (like lazy loading) inside the unordered list using AJAX.

While testing in the android device, I was expecting by default a scrollbar will come in the list view. But it is not coming. Is there anything missing?