category.add(defaultMutableTreeNode);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("DateChart06 - Month Scale", new DateChart06().getChart()));
category.add(defaultMutableTreeNode);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("DateChart07 - Year Scale", new DateChart07().getChart()));
category.add(defaultMutableTreeNode);
// Real-time category
category = new DefaultMutableTreeNode("Real-time Charts");
top.add(category);