[AS3] Popup Menu

I have a battle system for an RPG I'm working on and I have the whole system worked out but when it comes to casting skills, I want a window to open above the battle that one could select a skill to use or to cancel and go back to attack defend item(which also has the same problem) or run. Anyways I'm not sure whats the best way to code a new window popping up for the user to choose their skill and somehow have it return the info to the battle as the user's choice. I hope I explained what I'm trying to do reasonably well.

Anyways, thanks in advance,
ChaseNYC