I've observed that when I've got a row selected and I put the cursor in the borders (above and below) of the row, the cursor change to an arrow with a little square. The problem is that when this cursor is showed, if I click in the row, it dosen't unselect, that it is the normal behaviour.
Is there any way in which I can solve this?
The small square is the OLE D&D cursor. While you see this cursor, if you mousedown, you can then drag the current selection to, say, Excel.
If you do not want this functionality, turn off the OleDataSource flag in the ControllerOptions property of the grid.