code: public void onLoadingDone(Callback<String, String> onLoadingDone, int nrRetries) {
  		ImageReloader reloader = new ImageReloader(getSrc(), onLoadingDone, nrRetries);
  		asImage().addLoadHandler(reloader);
  		asImage().addErrorHandler(reloader);
  	}
docs: Apply a call-back that is executed when the image is done loading. This image is done loading when it has either
  loaded successfully or when 5 attempts have failed. In any case, the callback's execute method will be invoked,
  thereby indicating success or failure.
  
  @param onLoadingDone
  The call-back to be executed when loading has finished. The boolean value indicates whether or not it
  was successful while loading. Both the success and failure type expect a String. This is used to pass
  along the image URL.
  @param nrRetries
  Total number of retries should loading fail. Default is 0.