title: How to label more that 7 classes with featurePlot?
body: <p>I have plotted some train data with the following command</p>
  
  <pre><code>obj&lt;-featurePlot(x=otto.all[,1:5], y = otto.all$target, plot="pairs", auto.key = list(columns = 9))
  </code></pre>
  
  <p>data contains 9 classes in <code>target</code>. Unfortunately, I found, that function 
  had repeated colors for last two classes:</p>
  
  <p><img src="https://i.stack.imgur.com/B5McH.png" alt="enter image description here"></p>
  
  <p><strong>UPDATE</strong></p>
  
  <p>The following code</p>
  
  <pre><code>obj&lt;-featurePlot(x=otto.all[,1:5], y = otto.all$target, plot="pairs", auto.key = list(columns = 9),col=c("#d82b25","#073ca5","#9c9ea0","#ffce49","#03f92c","#16f4c2","#69167e","#191a92","#000000"))
  </code></pre>
  
  <p>apparently affects individual plots, but not the legend:</p>
  
  <p><img src="https://i.stack.imgur.com/kDVZ4.png" alt="enter image description here"></p>
  
  <p>As you see, cyan presents in plot, but absent in legend. Also legent still repeats last two colors.</p>
  
  <p>(last two colors are blue and magenta as first two)</p>
  
  <p>How to make it either not repeat automatically, or assign specific colors explicitly?</p>