Hi Sateesh,
Thank you for your update.
I'm still not able to reproduce the issue reported by you. I have hosted your sample which can be seen in the link below.
http://help.syncfusion.com/samples/Tools.Web/7.2.0.20/Forum92471/Main.htmI tried changing the year/month from the popup calendar and clicked the calendar to trigger the postback. After the postback I was able to see that the postback counter was incremented by one. Can you please try it in the above sample and let me know if you are able to reproduce? Please let me know if I have misunderstood your query.
In addition to our Community Forums, we have other customized support avenues like our Direct Trac Developer Support System
https://www.syncfusion.com/account/login?ReturnUrl=%2fsupport%2fdirecttrac%2fincidents and we hope you will take advantage of this system as well.
Regards,
Lakxman Kumar C