title: How to disable C3 chart's select points on line chart
body: <p>I have created this graph in c3 chart. Those two circles on red line are selected point. When I click on these points, they are going invisible. Also when I click on other points of green and red line. They are also selecting like these two. Is there any procedure to disable selection of other points ?
  <a href="https://i.stack.imgur.com/8GLEh.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8GLEh.jpg" alt="enter image description here"></a></p>
  
  <p>I don't want to select other points. When I click on other points, they are also selecting like
  <a href="https://i.stack.imgur.com/Bthsy.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Bthsy.jpg" alt="enter image description here"></a></p>
  
  <p>I am declaring c3's selected points by :</p>
  
  <pre><code>chart_tracker.select(['data2'],[19,47,]);
  </code></pre>