While reordering the rows in rad grid the scroll bar is not moving

Example : - 

i'm having 37 rows and scrolling is also shown and 

now see the pic 1 : i'm selecting one row and moving it down

now see the pic 2 : you can see the selected row is visible up to the height of the grid view

now see the pic 3 : if you still move the selected row down, its moving down but the scroll bar is not moving parallel and the selected row is not visible to the user