public static function sortByField(source:Array, propertyName:String, isDescending:Boolean = false):void {
			var numItems:uint = source.length;
			var i:uint;
			var isSorting:Boolean = true;
			while (isSorting) {
				isSorting = false;
				for (i = 0; i < numItems - 1; i++) {
					if ((!isDescending && source[i][propertyName] > source[i + 1][propertyName]) || (isDescending && source[i][propertyName] < source[i + 1][propertyName])) {
						var temp:Object = source[i];
						source[i] = source[i + 1];
						source[i + 1] = temp;
						isSorting = true;
					}
				}
			}
		}