ActionScript 3.0 :: Array Of Thumbnails - TextField Not Working

I'm creating an array of thumbnails. The images are being read via an xml file. This works fine. What doesn't work is the TextField I put underneath the thumbnail image.

Code:
Select all
var thumbContainer:MovieClip = new MovieClip();
thumbContainer.addChild(loadedThumb);
var sl = new slNum_mc; //This is being referenced as a class from the library.
sl.slideNumber.text = "abc"; //slideNumber is a dynamic textfield in the movie clip class sl, the initial
sl.slideNumber.y = 90; // text "abc" does apply at runtime
thumbContainer.addChild(sl);
addChild(thumbContainer);
searchSlideArray.push(thumbContainer); //Adds it to an array I already set up

This much does work. But when I try to trace it like this:
Code: Select alltrace(searchSlideArray[0].sl.slideNumber.text);
I get an error. How can I correctly reference the text in a text field that is housed in a movie clip class?