Another tab order question

I’ve made a nice little flash app that tabs through text boxes and buttons mostly the way I want to, with one exception. At one stage, a text box with a Yes/No confirmation pops up (it’s just a movie clip where I toggle the _visible property). The problem is, when the user tabs to “Yes”, then tabs to “No”, then hits tab again, the focus jumps out of the mini-dialog box and moves to the main movie.

Basically, I want to mirror the behavior of a dialog box, where you just tab between buttons in that box. So is there any way I can restrict the tabbing to keep it within a little loop?

Thanks!