Controlling movieclips

I am new to flash and I am trying to learn on how to control movieclips on different levels. I attached a small file where I have a movieclip on the main stage and a movieclip in side that movieclip. Inside the first movieclip I changed the alpha on the second moieclip. Then on the main time line I am trying to set the alpha back to 100%. I know I can do it with in the movieclip where I attached the first alpha but i was trying to figure out on how to do it from the main time line. Could use some help. Thanks