ActionScript 3.0 :: URLRequest Doesnt Contain Anything?

I have an xml file which contains multiple products each with their corresponding background image, foreground image, text and website. The LoadXML class loads this xml file and creates an array of each image, text and website. The Main class then loads each image from the array of background images in the method onBackgrLoad(). This is done through the use of a for loop which loops through the array of backgrounds (called hintergrund[]) and loads each one in turn. On tracing hintergrund[] I sucessfully receive a string of all the different background image paths. However when I examine the backgrRequest and backgrLoader they both contain null. The images therefore dont appear on stage but neither does an error message appear! The same thing happens for onImageLoad (this should load the foreground image) and onTextLoad.
 
public class Main extends Sprite
{
//____________________________________________________________________________Vars : Newly

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