ActionScript 3.0 :: Flash Event.COMPLETE Inside A Function?

I have created a class named XMLclass and inside that class there is a function named returnFillColor.The function looks like this:

Code:
public function returnFillColor(XMLchild:uint):String{
var xmlLoader:URLLoader = new URLLoader();
var xmlData:XML = new XML();

[code]....

When i call this function from my main class, it returns nothing because the XML wasn't done loading. I've double-checked this by adding addEventListener(Event.COMPLETE) outside the function.Is there any way to return data from the xml-file with just one function?(like adding event.Complete to the returnFillColor-function)