Classes help

ok so I started programming actionscript in classes because it just seems like a more efficient way to do it. But im still confused on how to pass things between two class files.
for instance i have these class files:

what this does so far is when i start my movie, it pulls the array of audio tracks from the xml file and plays them until it gets to the last audio track, at that point there should be a Prompt that shows up, which comes from the prompt section of the XML. My question is how do I actually get the xml from the xml file into and have that pass it to the file

any help would rule