Hi Alok,
I am afraid that I am not able to reproduce the issue. I have attached a simple sample with two series which displays the legend along with the checkboxes. Could you please try reproducing the issue with this sample and send to us so that it would be easier to find out the cause of the problem? Also please let me know the Essential Studio version you used to create the sample application.
F40771.zip
Thanks and Regards,
Geetha