title: How to add onclick event on the drawn measurement in potree library
body: <p>I'm using potree library in my reactJS application to display points cloud view.
  Using potree we can draw measurement(polygos, lines, markers) on the 3d view .
  But after drawing measurement i'm not getting click event when clicked on the drawn line or polygon.</p>
  <p>Can someone help to find the solution for this please ?
  Thanks in advance !</p>