title: C3.js show tooltip from button click
body: <p>I am using C3.js to graph some data. I want to be able to show the tooltip for the last data point series from a button click or even by default once the chart has rendered. Is there anyway to do this? Their documentation has a section for tooltip.show but there is no documentation for it.</p>
  
  <p><a href="http://c3js.org/reference.html#api-tooltip-show" rel="noreferrer">missing documentation</a></p>