code: function(type, stageX, stageY, target, nativeEvent, pointerID, primary, rawX, rawY) {
    this.initialize(type, stageX, stageY, target, nativeEvent, pointerID, primary, rawX, rawY);
  }
docs: This is passed as the parameter to mousedown, mouseup, mousemove, stagemouseup, stagemousedown, mouseover, mouseout
  and click events on {{#crossLink "DisplayObject"}}{{/crossLink}} instances.
  @class MouseEvent
  @uses EventDispatcher
  @constructor
  @param {String} type The event type.
  @param {Number} stageX The normalized x position relative to the stage.
  @param {Number} stageY The normalized y position relative to the stage.
  @param {DisplayObject} target The display object this event relates to. Note that this will be overwritten when the event is dispatched via EventDispatcher.
  @param {MouseEvent} nativeEvent The native DOM event related to this mouse event.
  @param {Number} pointerID The unique id for the pointer.
  @param {Boolean} primary Indicates whether this is the primary pointer in a multitouch environment.
  @param {Number} rawX The raw x position relative to the stage.
  @param {Number} rawY The raw y position relative to the stage.