@Override
 public Component getComponent() {
   if (panel == null) {
     panel = new ExtractedContentPanel();
     panel.addPrevMatchControlListener(new PrevFindActionListener());
     panel.addNextMatchControlListener(new NextFindActionListener());
     panel.addPrevPageControlListener(new PrevPageActionListener());
     panel.addNextPageControlListener(new NextPageActionListener());
     panel.addSourceComboControlListener(new SourceChangeActionListener());
   }
   return panel;
 }