On the alias's i sit on the question was raised:

"Guess this is a simple one but how can I view all the code in a code behind page in 2005?"

i didn't know the answer and had to look so thought other folks might be interested in the answer:

In the Project Menu choose > “Show all files”

–Your "Code Behind" will show up as an additional file under your form called like: “Form1.designer.vb”.