@SuppressWarnings({"deprecation" })
private void makeSystemClassesHidden(KnowledgeBase kb) {
Collection systemFrames = new HashSet(kb.getSystemFrames().getFrames());
for (Iterator iterator = systemFrames.iterator(); iterator.hasNext();) {
Frame frame = (Frame) iterator.next();
frame.setVisible(false);
}
kb.getRootCls().setVisible(true);
kb.getProject().setDisplayHiddenClasses(false);
}