title: TextGrob R - fontface=bold but no bold
body: <p>I'm trying to create a header for my graph pages with the text being bold. The code I'm using is below, I set fontface=bold but this doesn't seem to be working. 
  Is there somewhere else I need to set it as well?</p>
  
  <pre><code>t = textGrob(expression(underline("My Sample Header")),gp=gpar(fontfamily="serif",fontsize=16, fontface="bold",lineheight=1),vjust=.3,hjust=2.15)
  </code></pre>