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You must change dataSeries index on your functions.
line 152: chart.data[0].dataPoints[selected].y = yValue;
chart.data[0].dataPoints[selected].y = yValue;
line 163: chart.data[0].dataPoints[selected].y = yValue;
line 170: chart.data[0].set("cursor", "n-resize");
chart.data[0].set("cursor", "n-resize");
line 172: chart.data[0].set("cursor", "default");
chart.data[0].set("cursor", "default");
line 187: var dps = chart.data[0].dataPoints;
var dps = chart.data[0].dataPoints;
I tried something with using data mouseover events. Maybe you can improve this method.
http://jsfiddle.net/y3xvo7uc