ActionScript 3.0 :: Finding Width / Height Of Loaded Image

I am loading in a list of thumbnails from an XML file. The images are not always square but one of the dimensions is always 50pixels, whether it be height or width. Occasionally an image IS square. I am creating a 52x52 sprite and adding the loader image as a child to this sprite centrally. To do this I need to know the dimensions of the loaded images. (the loader object). Everything loads, parses and displays as it ought to, I just cannot find the width/height of the loaded image. Pics1List is an XML file.

ActionScript Code:
var imageLoader:Loader;
var request:URLRequest;
for (i = 0; i < (pics1List.picture.length()); i=i+1) {
var picture:MovieClip = new MovieClip();
imageLoader = new Loader();
[Code] .....

As you can see, I tried a few different things and frankly in the end just tried each combination I could!. The closest I got was when I used imageLoader.contentLoaderInfo.width and the error message was "The loading object is not sufficiently loaded to provide this information." which is why I added the event.complete function. However, this function never triggered so I commented it out.