ActionScript 3.0 :: Movie Clip Closes With No Mouse:Event?

This is the top third of the stage that the user sees. When they click on a computer a window is supposed to pop up. Everything is working fine at this point. The full screen, (the small hard-to-read button is Random Hardware which opens up a window to a random computer), a link to the "Digital Studio", and the computers when you click on them.It's after the window is open that the problem occurs. As you can tell there is an X in the upper right corner of the window. When the user presses that it is supposed to close the window and return to the normal stage. The "Software" text is clickable and sends the user to the websites of Adobe, Microsoft Office, etc. When the user clicks the software it works fine, but if the user clicks anywhere else in the window it just closes and returns to the first frame. There is nothing in my ActionScripting that puts an Event Listener to the window or the close sign.