title: How do you get the conditional colour shading in the each node using rpart.plot?
body: <p>I was using the below code, and in the output I was getting a nice conditional shading in each node, depending on the %age of the Target variable (Y/N). Higher the % of Y, darker the shade of green and higher the %age of N, darker the shade of red.</p>
  
  <pre><code>rpart.plot(Rpart_temp, type = 4 , extra =104, digits = 2, cex=1)
  </code></pre>
  
  <p>Now I am using a new machine, and all I get is a black and white plot. Even if I add <code>rpart.plot(Rpart_temp, type = 4 , extra =104, digits = 2, cex=1 , box.col=c("green", "red"))</code> I dont get the shading effect.</p>
  
  <p>Any ideas? Sorry, I cannot share the plot outputs.</p>