Hello!

I'm trying to make a sankey diagram 
here: http://www.eurchi.org/mipex-viz.html

I can load the chart fine, but the tooltip doesn't work. This is the code I 
use:

<html><head><script type="text/javascript"  src="
https://www.google.com/jsapi?autoload={'modules':[{'name':'visualization','version':'1.1','packages':['sankey']}]}
"></script>
<div id="sankey_basic" style="width: 1200px; height: 600px;"></div>
<script type="text/javascript">google.setOnLoadCallback(drawChart);
   function drawChart() {    var data = new google.visualization.DataTable
();    data.addColumn('string', 'Country');    data.addColumn('string', 
'Stakeholder');    data.addColumn('number', 'Weight');    data.addRows([   
   [ 'Austria', 'Press', 12 ],      [ 'Austria', 'NGOs', 16 ],      [ 
'Austria', 'Academics', 32 ],      [ 'Belgium', 'Press', 4 ],      [ 
'Belgium', 'NGOs', 3 ],      [ 'Belgium', 'Academics', 5 ],      [ 'France', 
'Press', 23 ],      [ 'France', 'NGOs', 4 ],      [ 'France', 'Academics', 
32 ],      [ 'Germany', 'Press', 32 ],      [ 'Germany', 'NGOs', 12 ],      
[ 'Germany', 'Academics', 34 ],    ]);        // Set chart options    var 
options = {      width: 1000,      sankey: { node: { width: 40 } },    };
    // Instantiate and draw our chart, passing in some options.    var 
chart = new 
google.visualization.Sankey(document.getElementById('sankey_basic'));   
 chart.draw(data, options);   }</script></head></html>

I tried to add a column for tooltips but apparently Sankey charts do not 
allow tooltip role columns.

Any idea of what I can do to get a tooltip?

Many thanks in advance for your help!

Alex

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