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    <p>You can make use of the <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/event/MenuListener.html" rel="nofollow"><code>MenuListener</code></a> which should provide you information about the state of the menu.</p> <p>This simple example creates a new menu item each time the menu is opened...</p> <pre><code>import java.awt.BorderLayout; import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.event.MenuEvent; import javax.swing.event.MenuListener; public class TestMenuBar { public static void main(String[] args) { new TestMenuBar(); } public TestMenuBar() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JMenuBar mb = new JMenuBar(); JMenu main = new JMenu("Test"); mb.add(main); main.addMenuListener(new MenuListener() { @Override public void menuSelected(MenuEvent e) { System.out.println("Selected"); JMenu menu = (JMenu) e.getSource(); menu.add(new JMenuItem("I'm dynamiclly created")); } @Override public void menuDeselected(MenuEvent e) { System.out.println("deselected"); } @Override public void menuCanceled(MenuEvent e) { System.out.println("Canceled"); } }); JFrame frame = new JFrame("Testing"); frame.setJMenuBar(mb); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.setSize(200, 200); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } } </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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