[visualization-api] Turn off inner box highlight on click

[mhjp]

Just did my very  first Google bar chart. Pretty straight forward, except 
that I can't figure out how to inhibit highlighting if a user clicks on one 
of the bars. Currently, a white inner box appears if I click on it. How do 
I inhibit this? At this point, I don't intend to provide for any 
interactive capability except for hover annotations. Thanks, Mike

Here's my current code:

<script type="text/javascript" 
src="https://www.google.com/jsapi?autoload={'modules':[{'name':'visualization','version':'1','packages':['corechart']}]}"></script>
<script type="text/javascript">
google.setOnLoadCallback(drawChart);
function drawChart() {
  var data = google.visualization.arrayToDataTable([
    ['Index', 'FFIUS', 'S&P 500'],
    ['10 Yrs', .77, .74],
    ['5 Yrs', 1.22, 1.12],
    ['3 Yrs', .62, .59],
    ['1 Yr', .48, .46],
    ['YTD', .05, .06],
    ['6 Mos', .12, .11],
    ['3 Mos', .03, .03],
    ['1 Mo', .02, .03]
  ]);
  var options = {
    chart: {bars: 'horizontal'},
    backgroundColor: { fill: '#f0f0f0' },
    colors: ['#1F4E79','#ADB9CA'],
    chartArea: {left: 50,top: 20, right: 40, bottom: 20, 
width:'85%',height:'75%', backgroundColor: '#f0f0f0'},
    legend: {textStyle: {fontName: 'Calibri', fontSize: 12, bold: true}, 
alignment: "center", position: "bottom"},
    bar: {groupWidth: "90%"},
    vAxis: {textStyle: {fontName: 'Calibri', fontSize: 12,bold: true}},
    hAxis: {
     textStyle: {fontName: 'Calibri', fontSize: 12,bold: true},
     format: '#%',
      viewWindowMode: 'explicit',
          viewWindow: {
                max: 1.25
      }
    }
  };
  var chart = new google.visualization.BarChart(
    document.getElementById('ffius-returns'));
  chart.draw(data, options);
}
</script>

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