protected void renderProperties(org.zkoss.zk.ui.sys.ContentRenderer renderer) throws java.io.IOException { super.renderProperties(renderer); //ZK-1638: preload image can also defined in zk.xml by library property render(renderer, "_preloadImage", Utils.testAttribute(this, "org.zkoss.zul.image.preload", false, true)); render(renderer, "src", getEncodedURL()); if (_hoversrc != null || _hoverimg != null) render(renderer, "hover", getEncodedHoverURL()); render(renderer, "align", _align); render(renderer, "hspace", _hspace); render(renderer, "vspace", _vspace); }