category2 = new StringChartDataModel(ChartDataModel.ChartType.bar);
category2.put("A", 1);
category2.put("B", 2);
category2.put("C", 3);
dateModel = new DateChartDataModel(ChartDataModel.ChartType.line);
dateModel.put(new GregorianCalendar(2013, 4, 1).getTime(), 4);
dateModel.put(new GregorianCalendar(2013, 4, 2).getTime(), 5);
dateModel.put(new GregorianCalendar(2013, 4, 3).getTime(), 6);