private void _addListeners() {
// First, this gets called back after GVT tree building done,
// so we can use it to determine the size of the rendered SVG
// (size not available until the gvt tree has been built)...
svgComponent.addGVTTreeBuilderListener(new GVTTreeBuilderAdapter() {
public void gvtBuildCompleted(GVTTreeBuilderEvent evt) {
svgBounds = evt.getGVTRoot().getBounds();