docs: protected Image convertToImage(Object imageDescription) {
  		if (imageDescription instanceof Image) {
  			return (Image) imageDescription;
  		} else if (imageDescription instanceof ImageDescriptor) {
  			return this.imageHelper.getImage((ImageDescriptor) imageDescription);
  		} else if (imageDescription instanceof String) {
  			return this.imageHelper.getImage((String) imageDescription);
  		}
  		return null;
  	}