title: R tableGrob change format of row
body: <p>I have some relatively simple code to create a table for printing to a PDF:</p>
  
  <pre><code>library(gridExtra)
  df &lt;- head(iris)
  tableGrob(df, gp = gpar(fontsize = 8), rows = NULL)
  </code></pre>
  
  <p>I'd like to make the last row the same format as the header row (bold, and darker gray background). I understand I can use gpar to control format of the entire table, but not sure how to just affect the last row.</p>
  
  <p>Thanks!</p>