Hi Veeru,
Thank you for using Syncfusion Controls.
We have created a sample to access the child control in TabControl . The sample can be downloaded from the below location.
Sample link:
http://www.syncfusion.com/downloads/Support/DirectTrac/101201/TestApp-1361858830.zip
Please revert to us if the sample doesnt meet your actual requirement .
Regards,
Yasvanth