All pro's could you help me out plz

i had problem in flash MX 2004 a simple problem that would you help me out, my problem is when a i click a button i want my movie clip be inputed in a certain box or in a frame? because had an experience that i just made a button and a box converting it in a symbol “movie clip” and what i did in my button is to target it in that box to load my movie clip in that certain box but what happnd is when i click the button my movie clip was load but the movie is not in the box its out side the box and its more even larger. how can i input my movie clip in certin box? is there any sulotion w/ that? is there an action script would you share plz… i’m just a begginer.