Is there a way, with Flash 4, to set the order of MCs?

Example: I am working on a project that looks similar to the Windows environment (not very original I know). I have several Movie Clips that look like windows that appear on the screen when they are called upon by clicking on buttons. The problem is when there is more than one visible at the same time, some always cover the others. Each MC has a button at the top that allows it to be dragged when pressed. Now, is there a way to bring a window (that is covered by another) to the front when the "Drag button" is clicked on?

I'm pretty sure this is possible because I think some of the windows on FlashChallenge.com do this.

Thanks in advance for any help,