category.add(defaultMutableTreeNode);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("ScatterChart03 - Single point", new ScatterChart03().getChart()));
category.add(defaultMutableTreeNode);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("ScatterChart04 - Error Bars", new ScatterChart04().getChart()));
category.add(defaultMutableTreeNode);
// Bar category
category = new DefaultMutableTreeNode("Bar Charts");
top.add(category);