How to mask an entire movie created in AS3

I have a Flash video. Since aspects ratio vary in monitors I need to mask the movie to keep off-stage objects, well, off-stage and out of sight.

This is a stand-alone video--it will not go on the web.

I'm probably missing something in this explanation so please bear with me as I fill in more details as solutions are offered. Thanks for that.
chevronrodAsked:
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Jen0910Commented:
You can create a mask layer as the top layer on your main stage. Set it to be the size of your stage, aligned properly and that should work.
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chevronrodAuthor Commented:
Well, well, that worked. Didn't think I could mask a whole bunch of stuff at once like that. Thanks!
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