title: How to add mouse click action to google treemap visualization
body: <p><a href="https://google-developers.appspot.com/chart/interactive/docs/gallery/treemap" rel="nofollow">The google treemap visualization</a> is very nice. Is there anyway to add a mouse click action to it (e.g. adding a hyper link so that a new browser window pop out when a particular tile is clicked.)? The document did not mention anything about mouse click event. </p>
  
  <p>If google visualization does not allow this, would you recommend anything else that is easy to use and has this functionality?Thanks a lot!</p>