external swf control flex applicaton?

Question

I have a flex application that loads an external swf file. I created the external swf file using flash cs4 so I can add code to it if that is what it takes.

Here is the code I use to load my external swf:

//add button swf
var request:URLRequest = new URLRequest("http://www.yadayada.com/media/but_button.swf");
var loader3:Loader = new Loader();
loader3.load(request);
addChild(loader3);
//position the ZoomControls

loader3.y = 0;
loader3.x = 0;

Can I have my external swf send click events to my flex application? How?