Hi Siva,
For the time being there is no server side method (or property) that will add the dock at the desired position (index) in the zone. This can be done with client-script rendered from the server. The following source code registers the script.
For your convenience I have attached the sample project that I tested.
Please do not hesitate to contact us, if you have any further questions.
Regards,
Pero
the Telerik team