Position of Horizontal ScrollBar on Postback

Question

Hi,

       In my application, I have one page which contain User Control. In that User Control there is one GridView. This GridView contain around 30 fields. Due to this Horizontal scroll bar come into picture. Now my problem is that, there is dropdownlist inside GridViewRow at 18 th position,  on SelectedIndexChanged event page get Partial post back as this is inside Update Panel. As it is partial post back the page position get to start of GridView.

       I want to maintain it at the same where it is previously. I tried with MaintainScrollPositionOnPostback="true". It is not working.

       Any help appreciated.

Regards,

 Vikram