title: Simple way to display row numbers on WPF DataGrid
body: <p><strong>I just want to display row numbers in the left-most column of my <code>DataGrid</code>.  Is there some attribute to do this?</strong></p>
  
  <p>Keep in mind, this isn't a primary key for my table.  I don't want these row numbers to move with their rows when a column is sorted.  I basically want a running count.  It doesn't even need to have a header.</p>