message: Unregister the UploadBar event listener on unmount
diff: @@ -25,12 +25,13 @@ module.exports = React.createClass({displayName: 'UploadBar',
  },
  componentDidMount: function() {
  - dis.register(this.onAction);
  + this.dispatcherRef = dis.register(this.onAction);
  this.mounted = true;
  },
  componentWillUnmount: function() {
  this.mounted = false;
  + dis.unregister(this.dispatcherRef);
  },
  onAction: function(payload) {
  