Hi Suba,
Sorry for the delay in responding.
HitTestRadius property controls the circle around the data point that would be considered as being within the bounds of this point for hit-testing purposes.
Please refer to the attached sample which illustrates the usage of HitTestRadius.
http://websamples.syncfusion.com/samples/Chart.Windows/F64772/main.htmIn the above sample the series context menu appears on right clicking anywhere around the series, which otherwise appears only on clicking exactly on the series.
Kindly let me know if you have any questions.
We appreciate your interest in Syncfusion products.
Best regards,
Golda.