The JPanel did not show when the menu is selected

Question

My program consists a JMenu bar with sub menu items. When the user select on the menu items a panel with the gridbag layout will show with all the labels.but the panel did not show. Can anyone show the problem for me ?
AdminFrameMain.java
public class AdminFrameMain
     private DisplayMenuBar menubar;
     private DisplayToolBar toolbar;
     private DisplayStatusBar statusbar;     
     public AdminFrameMain()
          JFrame frame = new JFrame("S-League Administration Management System");
          Toolkit kit = frame.getToolkit();
          Dimension windowsize =kit.getScreenSize();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          Container content = frame.getContentPane();
          content.setLayout(new BorderLayout());
          menubar = new DisplayMenuBar(frame,content);
          toolbar = new DisplayToolBar(content);
          statusbar = new DisplayStatusBar(content);
          frame.setSize(800,600);
          frame.setVisible(true);
     public static void main(String [] args){
          AdminFrameMain tm = new AdminFrameMain();
DisplayMenuBar.java
public class DisplayMenuBar
     private JMenu addMenu,addTeamMenu;
     private JMenuBar bar = new JMenuBar();
     private JToolBar toolbar = new JToolBar();
     private JMenuItem addTeamItem;
     private JFrame setFrame;
     private Container setContent;
     private AddTeamManagement addTeamMang;
     public DisplayMenuBar(JFrame frame,Container c)
          setFrame = frame;
          setContent = c;
          SetMenuBar();
     public void SetMenuBar()
     setFrame.setJMenuBar(bar);
     addMenu = new JMenu("Add");
     //file menu items list
     //Add sub menu
     addTeamMenu = new JMenu("Team Management");
     addMenu.add(addTeamMenu);
     //Add sub menu items
     addTeamMenu.add(addTeamItem = new JMenuItem("Add Team"));
     addTeamMenu.setMnemonic('T');     
     addTeamItem.setMnemonic('T');
     //team items listener
     //addTeamItem.addActionListener(taskcommand);          
     addTeamItem.addActionListener(new ActionListener()
          public void actionPerformed(ActionEvent e)
               AddTeamManagement addTeamMang = new AddTeamManagement(setFrame,setContent);
     bar.add(addMenu);
AddTeamManagement.java
public class AddTeamManagement
     private JPanel addTeamPanel;
     private JFrame frame;
     private JButton createTeamBt,resetTeamBt;
     private Container addTeamContent;
     private JTextArea teamDescTextArea,teamIndpTextArea;
     private JTextField teamNameField;
     private JLabel teamID,teamDesc,teamInfo,numOfPlayers,teamZone,playersNum;
     private GridBagLayout gridBag;
     private GridBagConstraints constraints;
     public AddTeamManagement(JFrame f,Container c)
          System.out.println("add team mg");
          addTeamPanel = new JPanel();
          frame = f;
          addTeamContent = c;
          gridBag = new GridBagLayout();
          addTeamPanel.setLayout(gridBag);
          addTeamPanel.setBackground(Color.pink);
          constraints = new GridBagConstraints();
          teamID = new JLabel("Team ID:");
          teamDesc = new JLabel("Team Description:");
          teamInfo = new JLabel("Team Info:");
          numOfPlayers = new JLabel("No Of Players:");
          playersNum = new JLabel("15 Maximun");
          teamZone = new JLabel("Team Zone:");
          constraints.fill = constraints.VERTICAL;
          constraints.weightx = 1;
          constraints.weighty = 0;
          addComponent(teamID,0,0,1,1);
          constraints.fill = constraints.VERTICAL;
          constraints.weightx = 1;
          constraints.weighty = 0;
          addComponent(teamDesc,1,0,1,1);
          constraints.fill = constraints.VERTICAL;
          constraints.weightx = 1;
          constraints.weighty = 0;
          addComponent(teamInfo,2,0,1,1);
          constraints.fill = constraints.VERTICAL;
          constraints.weightx = 1;
          constraints.weighty = 0;
          addComponent(numOfPlayers,3,0,1,1);
          constraints.fill = constraints.VERTICAL;
          constraints.weightx = 1;
          constraints.weighty = 0;
          addComponent(teamZone,4,0,1,1);
          System.out.println("showing");
          addTeamContent.add(addTeamPanel,BorderLayout.CENTER);
     public void addComponent(Component component,int row,int column,int width,int height)
          System.out.println("adding c");
          constraints.gridx = column;
          constraints.gridy = row;
          constraints.gridwidth = width;
          constraints.gridheight = height;
          gridBag.setConstraints(component,constraints);
          addTeamPanel.add(component);
          addTeamPanel.setVisible(true);
}

Answer 1

Hello,
you are missing only one link, just add following line to your actionPerformed method of DisplayMenuBar class and all problem will be solved
setContent.validate();
Actually, Swing component does not updated automatically. when you do any changes to the component layout it will set that component as invalidated component. To update the view you need to call validate() method defined in JComponent class.
Virus