title: Disable DataGrid current cell border in FullRow selection mode
body: <p>I am using a DataGrid in row selection mode (i.e., <code>SelectionUnit="FullRow"</code>). I simply want to remove the border that is being placed around the current cell when the user highlights a row in order to have true full row selection (and no cell level selection). I don't mind the notion of the grid maintaining the current cell, I just want to remove that pesky current cell border, perhaps by changing the style of the current cell. What is the easiest way to do this?</p>