Actionscript 3 :: Flex4 - Copy An ArrayCollection Of Transfer Objects?

public function create():ArrayCollection{
var index:int = 0;
var data:ArrayCollection = new ArrayCollection();

[Code]....

originalData is the original state of my data from database. data is a copy of originalData used to be manipulated as the provider for my List component. There's a button I use to call the create() function above, that would mean, I want to revert all changes in data, and go back to everything I have in originalData.

But when I debug my function, originalData has all the changes made in data.

When I use

list.selectedItem.thing = "new string";

is supposed to modify data[index].thing, because data is my List.dataprovider. but it changes originalData[index].thing also and this collection wasn't used for anything, except for creating a copy of itself!

I don't know why this happens. I didn't know how to phrase this behaviour as a google query.

This has consumed more time than its functionality is worth.

EDIT:

I've also tried this, but it doesn't work:

public function create():ArrayCollection{
var index:int = 0;
var data:ArrayCollection = new ArrayCollection();

[Code].....