title: ggplot2 and ggdendro - plotting color bars under the node leaves
body: <p>Currently I'm using <code>ggplot2</code> and <code>ggdendro</code> to plot dendrograms. However Now I'm in need to plot a discrete variable under the leaves along with the labels.</p>
  
  <p>For instance, in a publication (Zhang et al., 2006) I saw a dendrogram like this (notice th color bar under the leaf labels):</p>
  
  <p><img src="https://i.stack.imgur.com/BdbHH.jpg" alt="Example dendrogram"></p>
  
  <p>I'm interested in doing the same with ggdendro + ggplot2, using data which I have already binned. Is this possible? </p>