Datagrid Selection Problem!

[Santal_Maluko]

Hi All

I have a little question hope someone can help me... I've been around this problem for a long time ago!

I have a datagrid, and when I move the selection row up or down with the arrow keys and the selection is on top or at the botton of the grid the selection desapears??? can someone tell me how to fix this issue!????

Thanks in Advance :P