if (ruleApplicationsParameter != null) {
bt_opgraph.addActionListener(new ActionListener() {
@Override
public void actionPerformed(final ActionEvent ae) {
ViewerPrefix vp = (DebugViewerCreator.this.viewerPrefix==null)? new ViewerPrefix(DebugViewerCreator.this.usePrefixes.isTrue(), null) : DebugViewerCreator.this.viewerPrefix;
new Viewer(ruleApplicationsParameter, "OperatorGraph", false,
DebugViewerCreator.this.fromJar, vp);
}
});
}