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I managed to solve this issue my self by using the following code in the click function of the pie chart:
var activePoints = window.trackingPie2.getElementsAtEventForMode(evt, 'point',
window.trackingPie1.options);
var firstPoint = activePoints[0];
var label = window.trackingPie2.data.labels[firstPoint._index];
I added “window.” to the call to the pie chart and used “getElementsAtEventForMode’ instead of “getElementAtEvent” to get pull in the data.
Source:stackexchange.com