How to select certain part of a chart and then add event listener to it.

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Dec 28, 2016, 1:26:40 PM12/28/16

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Hallo, everyone :)

Sorry if my question sounds a little bit stupid, but I can't figure out how can I add an event listener to a certain part (piece) of a PieChart?

For example someone hovers over Mushooms and another chart about the Mushrooms is shown.

How can I "EXTRACT" this musrooms piece from the variable chart?

var chart = new google.visualization.PieChart(document.getElementById('chart_div'));

Thank you in advance. I appretiate each answer and the time devoted.

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