title: mschart: Different background colors for different y-value ranges?
body: <p>Is there any way I can create a line chart using mschart where the chart area's background color changes for different ranges of y values?</p>
  
  <p>For instance, a line chart would have a green background for y values 0 - 10, a yellow background for y values 10 - 20 and a red background for y values 20 - 30.</p>
  
  <p>A gradient will not work, the colors must be solid.</p>
  
  <p>I might have to use a background image, but I think there might be a better way.  Unfortunately, web searches haven't turned anything up.</p>