category.add(defaultMutableTreeNode);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("BarChart04 - Missing Point in Series", new BarChart04().getChart()));
category.add(defaultMutableTreeNode);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("BarChart05 - GGPlot2 Theme", new BarChart05().getChart()));
category.add(defaultMutableTreeNode);
defaultMutableTreeNode = new DefaultMutableTreeNode(new ChartInfo("BarChart06 - Histogram Overlapped", new BarChart06().getChart()));
category.add(defaultMutableTreeNode);