Loading Library Assets from Loaded swf:

To load Movieclip from library in AS3:
var Content_mc:MovieClip= new MovieClip()

where Content_mc is the linkage name similarly to load content from loaded swf

var Content_mc:Class = event.target.applicationDomain.getDefinition(”Content_mc”) as Class
var new_content_mc:MovieClip = new Content_mc() as MovieClip;
addChild(new_content_mc);

Note : place this code in Complete Event ie., after preloading