_x and _y in a mc within a mc

i would like to set the x and y cords of mc2 so that when i attachmovie it to mc1, the same top left corner pixel is the same. mc2 is longer than mc1, but they are the same width. i have tried doing mc1.mc2._x = mc1._x but then my mc2 does not appear on the stage at all. i know in attachmovie there is a place where you can set options… can you set x and y cords in there and if so how? is there a better way to handle this problem?

nevermind. i got it figured out.