I am not sure what you mean...I 'll take a stab though.
It all depends on what you stored in the first element of the vector. Whatever it is, hopefully it's something that you can ake a size of. If it's a
string, cast it back to a string, and then check it's size. Do the same if it's an array, or another type of collection.
ex. (String) yourVector.elementAt(0)
Bosun