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    <p>It's simply a matter of references. The code that adds something to the JDesktopPane must have a reference to it, and so you will need to pass that reference into the class that needs it say via either a constructor parameter or a method parameter. </p> <p><strong>Edit 1</strong><br> For example:</p> <pre><code>import java.awt.*; import java.awt.event.*; import java.util.Random; import javax.swing.*; public class ReferenceExample extends JPanel { private JDesktopPane desktop = new JDesktopPane(); private Random random = new Random(); public ReferenceExample() { JButton addInternalFrameBtn = new JButton("Add Internal Frame"); addInternalFrameBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { addInternalFrame(); } }); JPanel btnPanel = new JPanel(); btnPanel.add(addInternalFrameBtn); setPreferredSize(new Dimension(600, 450)); setLayout(new BorderLayout()); add(new JScrollPane(desktop), BorderLayout.CENTER); add(btnPanel, BorderLayout.SOUTH); } public void addInternalFrame() { MyInternalFrame intFrame = new MyInternalFrame(ReferenceExample.this); int x = random.nextInt(getWidth() - intFrame.getPreferredSize().width); int y = random.nextInt(getHeight() - intFrame.getPreferredSize().height); intFrame.setLocation(x, y); desktop.add(intFrame); intFrame.setVisible(true); } private static void createAndShowUI() { JFrame frame = new JFrame("Reference Eg"); frame.getContentPane().add(new ReferenceExample()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { createAndShowUI(); } }); } } class MyInternalFrame extends JInternalFrame { // pass in the reference in the constructor public MyInternalFrame(final ReferenceExample refEg) { setPreferredSize(new Dimension(200, 200)); setClosable(true); JButton addInternalFrameBtn = new JButton("Add Internal Frame"); addInternalFrameBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // use the reference here refEg.addInternalFrame(); } }); JPanel panel = new JPanel(); panel.add(addInternalFrameBtn); getContentPane().add(panel); pack(); } } </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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