I have 4 tap strips A,B,C & D.When I click on A - it should display my custom controls within A,similarly B should display its own custom controls followed by C and D however all the tapstrips displays only custom controls of A.
could you please post some code (ASPX), it is hard to tell WHY something doesn't do what you expected while it's unclear HOW you did it.
Meanwhile a minmalistic "solution" - maybe it helps you to find out what's going wrong:
Using MultiPage should be the right option as suggested by Manfred. The PageViewIds' for the respective tabs can be set to the corresponding PageViewIds' to view diferent controls or pages on each tab click. Also take A look at the following demo which can guide you better. TabStrip / MultiPage