// Date category
category = new DefaultMutableTreeNode("Date Charts");
top.add(category);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("DateChart01 - Millisecond Scale", new DateChart01().getChart()));
category.add(defaultMutableTreeNode);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("DateChart02 - Second Scale", new DateChart02().getChart()));
category.add(defaultMutableTreeNode);