Editing panels

Question

I made a test app that has 1 form and 2 panels within it.
I can switch panels with some navigation that I made, however I find that I can now only edit the last panel created. If I select panel 1, and try to insert content into it, it always reverts to panel 2 instead, and puts the content their.

I am using VS 2010 express. How can I edit Panel 1, without moving or deleting Panel 2.