minor clean up

src/main/java/com/xeiam/xchart/PlotContent.java

@@ -93,7 +93,7 @@ public class PlotContent implements IChartPart {
         }
         if (chart.getAxisPair().getXAxis().getAxisType() == AxisType.DATE) {
           x = new BigDecimal(((Date) xItr.next()).getTime());
-          System.out.println(x);
+          // System.out.println(x);
         }
 
         BigDecimal y = new BigDecimal(yItr.next().doubleValue());

src/main/java/com/xeiam/xchart/swing/SwingWrapper.java

@@ -87,9 +87,7 @@ public class SwingWrapper {
         // Create and set up the window.
         JFrame frame = new JFrame("XChart");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-        // frame.setSize(new Dimension(charts.get(0).getWidth(), charts.get(0).getHeight()));
         JPanel chartPanel = new XChartJPanel(charts.get(0));
-        // frame.getContentPane().add(chartPanel);
         frame.add(chartPanel);
 
         // Display the window.
@@ -119,7 +117,7 @@ public class SwingWrapper {
         for (Chart chart : charts) {
           if (chart != null) {
             JPanel chartPanel = new XChartJPanel(chart);
-            frame.getContentPane().add(chartPanel);
+            frame.add(chartPanel);
           } else {
             JPanel chartPanel = new JPanel();
             frame.getContentPane().add(chartPanel);