Hi Naidu,
Was the Tabset every working for you ?
What is the exact version of the Xcelsius that you are using ?
It is quite likely a bug. This is a very basic feature and should be working.
Check out the SAP note : 1276199
Summary : It talks about a similar behavior wherein switching between tab is not working & this has been logged as a bug.
Hope this helps !!
Regards,
Monish