I'm pretty sure you cannot clone editboxes. However you should be able to clone a child movie with and editbox. Flash really dosen't allow alot of things that 3dfa seems to do like elements having certain properties like alpha, etc. what 3dfa does in make them into child movies behind the scenes to allow for that, There is script for creating editboxes at runtime but I just tired it and it doesn't work in 3dfa. But just put your editbox in a child movie and clone that and it should work fine.