function renderItems() {
	var posY = 50;
	for(var i=0; i<feedItems.length; i++){
		var newItem = new lib.ItemRenderer();
		newItem.title.text = feedItems[i].title;
		newItem.title.mouseEnabled = false;
		newItem.id = i;
		newItem.x = 5;
		newItem.y = posY;
		itemContainer.addChild(newItem);
		posY += newItem.getBounds().height + 4;
	}
}

Add to AJAX:
renderItems();