[FMX] SImple question about locking a movie clip's position

Hello,

I have a simple question, but for the life of me I can’t figure it out. I’m an ActionScript beginner, by the way.

I have a simple drag and drop interface, fill in the blank type thing, and I wat to lock a specific move clip’s position once it’s dropped in the appropriate place. Make sense? Thank you in advance for any help you can give me.