为什么我的datagridview重新定位转义

I have a DataGridView control on a form in a manged c# project. (.net 2.0) When I use the scroll button on my mouse and then click a cell and click the escape button or select another cell the grid will reposition it self. But if i use the scrollbar on the control, this behavior does not happen.I have a DataGridView control on a form in a ma