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    <p>I did a really quick test, but because you've not provided us with runnable example, it's not possible to reproduce your problem.</p> <p>What I "suspect" is your <code>for-loop</code> is crashing for some reason (the <code>griddim</code> is null or there's an out bounds exception) which is causing the EDT to become unstable.</p> <p>Until you enlighten use with a repeatable, runnable example, we're never going to be sure</p> <pre><code>public class TestGridLine { public static void main(String[] args) { new TestGridLine(); } public TestGridLine() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new GridPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class GridPane extends JPanel { private boolean gridline; public GridPane() { setLayout(new GridBagLayout()); JButton btn = new JButton("Grid"); btn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { setGridLine(!isGridLine()); } }); add(btn); } @Override public Dimension getPreferredSize() { return new Dimension(200, 200); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); int width = getWidth() - 1; int height = getHeight() - 1; //GridBox g.setColor(Color.BLACK); g.drawRect(0, 0, width - 1, height - 1); g.setColor(Color.WHITE); g.fillRect(1, 1, width - 1, height - 1); //draw grid lines if (gridline) { g.setColor(Color.getHSBColor(150, 150, 200)); //vertical lines for (int v = 0; v &lt; width - 2; v += 10) { g.drawLine(v, 1, v, height - 2); } //horizontal lines for (int v = 0; v &lt; height - 2; v += 10) { g.drawLine(1, v, width - 2, v); } } } //returns boolean gridline public boolean isGridLine() { return gridline; } //set the grid line true or false public void setGridLine(boolean islines) { if (islines != gridline) { gridline = islines; repaint(); } } } } </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.

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