title: AmStockChart change colors for whole fields while activate/deactivate one
body: <p>I have AmStockChart which is initialized by JSON with variable count of fields (usually near 20). I do not set color anywhere now.</p>
  
  <p>By clicking on graph label selected graph disabling and all the others change colors.</p>
  
  <p>Yes, I can set colors for each graphs, but my colors are not as beautiful :)</p>
  
  <p>How can I prevent color switching?</p>