title: Core plot: grid lines background color
body: <p>I want to be able to put background color in the spaces between the grid lines of the y axis. Can this be achieved with core plot ? If so, how ?</p>
  
  <p>Any help and/or example code will be much appreciated.</p>
  
  <p>Thank you,</p>
  
  <p>Petar</p>