Hi Sushant,
Thank you for your interests in Syncfusion products.
We have analyzed the reported issue with our sample; we are not able to reproduce the issue in windows 7 OS. We have created a sample to test this issue. Can you please revert us by modifying the sample based on your application along with the replication procedure. This would be helpful for us to serve you.
Sample :
http://www.syncfusion.com/downloads/Support/DirectTrac/85216/toolstripcheckbox321360174.zip
Please let us know if you have any concerns.
Regards,
Berkunath