Hi Ampelio,
Thank you for using Syncfusion products.
I am afraid it is not possible to directly raise event for particular legend object.
But as a workaround , you can set 'VisibleCheckBox' property for the legend object and raise alert using CheckedChanged event.
The following code snippet illustrates this.
[C#]
this.chartControl1.Legend.Items[0].CheckedChanged+=new EventHandler(Series1_CheckedChanged);
Please refer the modified ChartLegendSample and let me know if this helps you.
http://websamples.syncfusion.com/samples/Chart.Windows/F68356/main.htmRegards,
Jaya