Problem with tabbed pane containing an image - never calls paint method on tab select

[Rudiger Diezman]

I am using a tabbed pane with four tabs - three of which work perfectly - the fourth one is supposed to display an image but does NOT ever call the
paint method. When I use the same ImagePanel code but add it to a JFrame of its own everything works perfectly.
ANY ideas would be welcome.

setup of ImagePanel:

  public ImagePanel(BufferedImage image)
   {
    fImage = image;
   }
 
  public void paint(Graphics g)
   {
     System.out.println("Entering paint for image");
    if (getSize().width <= 0 || getSize().height <= 0)
     {
      return;
     }
 
    Graphics2D g2 = (Graphics2D) g;
 
    if (fImage != null && isShowing())
     {
      g2.drawImage(fImage, 0, 0, this);
     }
   }
 

setup of tabbed pane:

  public JTabbedPane createTabbedPane()
   {
    JTabbedPane tPane = new JTabbedPane();
    tPane.setSize(600, 450);
 
    JComponent panel1 = makeTextPanel();
    tPane.addTab("Text Content", panel1);
 
    JComponent panel2 = makeImagePanel();
    tPane.addTab("Image Content", panel2);
 
    JComponent panel3 = makePropsPanel();
    tPane.addTab("Properties", panel3);
 
    JComponent panel4 = makeKeysPanel();
    tPane.addTab("Keys", panel4);
 
    return tPane;
 
   }
  public JComponent makeImagePanel()
   {
    JPanel panel = new JPanel(false);
    panel.setLayout(null);
    panel.setBounds(100, 100, 400, 400);
    BufferedImage img = null;
    if (fSheet.fImageBuffer != null)
     {
      try
       {
        img = ImageImport.makeBufferImage(fSheet.fImageBuffer);
       }
      catch (Exception e)
       {
         System.out.println("Unable to make buffer for image " + e);
         Displays.ShowErrorDialog("Unable to make buffer for image");
       }
      //ImagePanel.createAndShowGUI(img, fSheet.getFName());
      panel.add(new ImagePanel(img));
     }
    return panel;
   }
 

[Diezmann]

Although I have solved the problem for myself I do NOT like the solution.
Apparently a NULL layout will cause the painting not to be done. By specifying a GridLayout 1x1 the thing works.