focusManager = new FocusManager(document);
SVGOMDocument svgDocument = (SVGOMDocument)document;
CSSEngine cssEngine = svgDocument.getCSSEngine();
cssPropertiesChangedListener = new CSSPropertiesChangedListener();
cssEngine.addCSSEngineListener(cssPropertiesChangedListener);
}
/**
* Adds to the eventListenerList the specified event listener
* registration.