title: Is it possible to have more than two panes in HighStock chart?
body: <p>I would like to be able to plot a chart data which has the usual Open High low and Close plus the Volumes and Open Interest. These are to be represented in 3 panes:
  Pane 1: Open High Low Close
  Pane 2: Volumes
  Pane 3: Open Interest.</p>
  
  <p>The 'Two Panes, Candlesticks and Volumes' example from HighCharts (highStock) only deals with Pane 1 and 2. So the question is if possible to plot a third pane under the Volumes pane where I can have my Open Interest Bars?
  Thanks</p>