Hi,
you are very close ;]
try this:
// put the visualization in a variable, for later use
var piechart = new
google.visualization.PieChart(document.getElementById('visualization'));
google.visualization.events.addListener(pie1, 'onmouseover',
function(e) {
// use it..
piechart.setSelection([e]);
});
// now draw it
piechart.draw(data, null);
HTH
BugChart.
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