title: transferring value from a google map to a rchart in shiny application
body: <p>I have a shiny app in which I plot a map with <code>plotGoogleMaps</code> and a <code>rChart</code>, with values related
  to some markers in the map, rendered via <code>rPlot</code>. </p>
  
  <p>The app user can click on a marker in the map to show a tooltip.</p>
  
  <p>I'd like that when he clicks on the marker, the pertinent value in the chart would be highlighted.</p>
  
  <p>Anybody knows how to perform this task?</p>
  
  <p>Thank you.</p>