Hi Nick,
You can get the position of vertical scroll bar using the GetCurrentVScrollPixelPos() method and set the position of vertical scroll bar using the SetCurrentVScrollPixelPos() method. Using these methods you can able to move the ScrollBar as required. Please refer to the attached sample for more details.
http://www.syncfusion.com/Support/user/uploads/Forum_40341_3Feb_RetainFocus_753962e7.zipLet me know if this helps.
Best Regards,
Haneef