Thank you Peter,
I was able to solve this issue by putting position: relative to the div with id content so the widget use the reference of the father and it will works correctly if we need that the scrollbar has to be in the div and not in the window.
Below there is the change that works.
Thank you very much.
<div id='content' style="overflow: auto; position: relative;"> <div style="width: 5000px; "> <div id='jqxWidget'> </div> </div> </div>
