title: Sencha Touch theming: how are active/selected colors calculated from $base-color?
body: <p>I did set the <code>$base-color</code> of my application to <code>#000000</code>, using Sencha Touch 2.3.1 and the default theme.</p>
  
  <p>List selections, picker bars and other "active elements" are displayed in colors that range from pink to red.</p>
  
  <p>I would like to have all those elements gray instead. Is there an alternative way of changing these, other than going through the whole app to find the relevant classes?
  I guess it would be nice to have a <code>$secondary-color</code> variable that could be switched to control those, does such a variable exist?</p>
  
  <p>Any suggestion would be helpful.</p>