private function findPropertyAtArrayCollection(arrayCollection:ArrayCollection, object:Object):Number
{
	var n:Number = arrayCollection.length;
	var index:Number = -1;
 
	for(var i:uint = 0; i < n; i++)
	{
		if(object["uri"] == arrayCollection[i].uri)
			index = i;
	}
 
	return index;
}