category.add(defaultMutableTreeNode);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("ThemeChart02 - GGPlot2 Theme", new ThemeChart02().getChart()));
category.add(defaultMutableTreeNode);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("ThemeChart03 - Matlab Theme", new ThemeChart03().getChart()));
category.add(defaultMutableTreeNode);
// Date category
category = new DefaultMutableTreeNode("Date Charts");
top.add(category);