code: private JPanel getPaneContent() {
  		if (paneContent == null) {
  
  			paneContent = new JPanel();
  			paneContent.setLayout(new BoxLayout(getPaneContent(), BoxLayout.Y_AXIS));
  			paneContent.setEnabled(true);
  
  			paneContent.add(getMainToolbarPanel(), null);
  
  			paneContent.add(getPaneDisplay(), null);
  			paneContent.add(getMainFooterPanel(), null);
  
  		}
  		return paneContent;
  	}
docs: This method initializes paneContent
  
  @return JPanel