header row does not scrolll along with the contents

jqueryNew

Hello,
I am trying to reproduce a scenario to show my problem with the Scroll feature in using Datatables. My issue is that when I scroll on the horizontal bar, the headers do not scroll with the contents below it, which is within the <tbody> tag. You can see my test case at http://live.datatables.net/yakuxudi/1/ This is my first time using that website, I hope it shows my issue there.

debugger99

just add {scrollX:'true'} property and it works, find test case http://live.datatables.net/vupocapi/1/edit