title: Customise Highstock tooltip conditionally
body: <p>I would like to make tooltip in Highstock styled differently(not just style of content, but style for tooltip itself. For example, different padding, shadow, border radious etc) when hovering over flag series and line serieses. However, it looks like these properties needs to be configured in the tooltip configuration object. Not sure if it can be dynamically changed.</p>
  
  <p>Like in this jsbin:
  <a href="http://jsbin.com/cixowuloxa/1/edit?js,output" rel="nofollow noreferrer">http://jsbin.com/cixowuloxa/1/edit?js,output</a></p>
  
  <p>What's the better way to give 'Summer arrives' tooltip different style than other shared tooltips?</p>