docs: function setAsyncContent(event) {
  
              that._content.innerHTML = event.response;
  
              /**
               * Event emitted when the content change.
               * @event ch.Content#contentchange
               * @private
               */
              that.emit('_contentchange');
  
              /**
               * Event emitted if the content is loaded successfully.
               * @event ch.Content#contentdone
               * @ignore
               */
  
              /**
               * Event emitted when the content is loading.
               * @event ch.Content#contentwaiting
               * @example
               * // Subscribe to "contentwaiting" event.
               * component.on('contentwaiting', function (event) {
               *     // Some code here!
               * });
               */
  
              /**
               * Event emitted if the content isn't loaded successfully.
               * @event ch.Content#contenterror
               * @example
               * // Subscribe to "contenterror" event.
               * component.on('contenterror', function (event) {
               *     // Some code here!
               * });
               */
  
              that.emit('content' + event.status, event);
          }