In short, using the Extended mode, if a column has been selected by clicking the header, then clicking an item in that column does not deselect the column before it selects the item. The only ways to deselect the column are to click the row header which selects a row or drag a selection. I wasn't talking about selecting the same item, but selecting the column (which sets row 0 as the current item), then clicking another item. That should deselect the column and select the item. Currently, it leaves the column selected, and moves only the current item.