Web Site split screen

Question

Hi, guys
I know this should be something very basic to your'll, but i just cant get it to work...
What i wanna do is:
I've created a website im VS 2005, C#, now i wanna split the screen and keep the TreeView menu on the left and the pane on the right must display different pages. I have tried many different components but i cant seem to get it to work, is there sumwhere that i can download an example that shows the GUI?
Any assistance will be appreciated.
Thank you