title: Single line borders in FlowDocument Tables
body: <p>I have a FlowDocument table where I want to spice up the layout a bit. I'm thinking something like a thin line separating the sub amounts on an invoice from the total or something like the line under the header row typically featured in the standard Word 2007+ table styles.
  I was hoping that I could just add an empty TableRow and set the height to a few pixel units, but I find no property to force the height of a row to my desire.</p>
  
  <p>Is there a way (or hack) to make a thin border line under or over an entire row in a System.Windows.Documents.Table?</p>