Tab Page Control

Question

Hi, 

I am building an application using Tab Control. I'ld like to know:

(1) How to transfer the basic codings to the Tab Page. 

     for example: 

    - the code behinds - using System... (as each page require different references)

    - the page_load coding

Where do I write all these codings to, since I cant double click the tab-page as to put all these codes?

Thanks.

p.s: C# Language.