🚀 go-pugleaf

Is it just me, or is the JTabbedPane right out there?

Creating a real simple d&d JTabbed pane with one button & 1 panel, all is
OK, and it runs fine. (Or is subclassed OK).

When I switch back to JBuilder, I can see the source pane fine.
When I switch to Design mode- ka-boooom.

The Class (window?) displays itself in a "phantom" Appletviewer- which is
not available on the windows task bar- and the design panel is empty. (You
can sort of select "invisible" objects in the design window though).

Is this a known bug? Have I selected some weird "floating in the ether"
option on the JBuilder parameters?

Cheers, Jon.

(PS- minimum code required to cause the above pasted below).
package practice;

import java.awt.*;
import com.sun.java.swing.*;
import java.awt.event.*;

public class SwingTabbedPages extends JFrame {
  JTabbedPane jTabbedPane1 = new JTabbedPane();
  JButton exitBut = new JButton();


  public SwingTabbedPages() {
    try  {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  private void jbInit() throws Exception {
    exitBut.setText("Exit");
    exitBut.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        exitBut_actionPerformed(e);
      }
    });
    this.getContentPane().add(jTabbedPane1, BorderLayout.CENTER);
    jTabbedPane1.addTab("jButton1", exitBut);
    this.setSize(400,400);
    this.setVisible(true);
    this.setSize(new Dimension(327, 388));
  }

  void exitBut_actionPerformed(ActionEvent e) {
    setVisible(false);
    dispose();
  }
}