Default How to tell WhatsApp.....

When I install WhatsApp, it installs the Stock Android whtsapp version.. which I don't like..(The UI is not so good)

I want to tell or bluff whatsapp to install "Samsung Galaxy S2" version of whatsapp..

Since im running CM, it straight away install the whatsapp UI which is found in stock android.. but I want the whatsapp UI which is found in Stock samsung galaxy rom..

So any idea ??