code: private JPanel getPanelSession() {
  		if (panelSession == null) {
  
  			panelSession = new JPanel();
  			panelSession.setLayout(new BorderLayout());
  			panelSession.setName("SessionTech");
  			panelSession.add(getTechTree(), BorderLayout.CENTER);
  		}
  		return panelSession;
  	}
docs: This method initializes panelSession
  
  @return javax.swing.JPanel