Accessing dynamic text from inside an addChild object

Can’t figure this out for the life of me. Its probably something simple, but I can’t find any solutions online. Can anyone help a brother out here? All I’m trying to do is assign text to a dynamic text box that is inside a movieclip (loaded from the library using addChild()

Heres my code (obviously wrong) :

for(var i:uint=0; i<myXML..length(); i++) {
var myMC:MovieClip = new content_mc();
myMC.y = i
170;
myMC.title_txt.text = “Blah”;
this.content.addChild(myMC);
}