code: function ProgressEvent(loaded, total) {
  		this.Event_constructor("progress");
  
  		/**
  		 * The amount that has been loaded (out of a total amount)
  		 * @property loaded
  		 * @type {Number}
  		 */
  		this.loaded = loaded;
  
  		/**
  		 * The total "size" of the load.
  		 * @property total
  		 * @type {Number}
  		 * @default 1
  		 */
  		this.total = (total == null) ? 1 : total;
  
  		/**
  		 * The percentage (out of 1) that the load has been completed. This is calculated using `loaded/total`.
  		 * @property progress
  		 * @type {Number}
  		 * @default 0
  		 */
  		this.progress = (total == 0) ? 0 : this.loaded / this.total;
  	}
docs: constructor 
  A CreateJS {{#crossLink "Event"}}{{/crossLink}} that is dispatched when progress changes.
  @class ProgressEvent
  @param {Number} loaded The amount that has been loaded. This can be any number relative to the total.
  @param {Number} [total=1] The total amount that will load. This will default to 1, so if the `loaded` value is
  a percentage (between 0 and 1), it can be omitted.
  @todo Consider having this event be a "fileprogress" event as well
  @constructor