JFrame as MessageBox doesn´t show it´s controls

Hi,
 
I want to show the progress of loading records from a database into my JTree and a label in a JFrame. But - the label and the progressbar doesn´t appear in my JFrame-window.

I added the following class:


package DokViewer;

import java.awt.*;
import java.awt.Color;
import javax.swing.*;
import com.borland.jbcl.layout.*;

public class Fortschrittsanzeige extends JFrame
{
  JLabel jLabel1;
  JProgressBar jProgressBar1;
  VerticalFlowLayout verticalFlowLayout1;

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

  public void Close()
  {
    this.setVisible(false);
    // finalize(); // not necessary?
  }

  private void jbInit() throws Exception
  {
    jLabel1 = new JLabel();
    jProgressBar1 = new JProgressBar();
    verticalFlowLayout1 = new VerticalFlowLayout();

     
    this.getContentPane().setLayout(verticalFlowLayout1);
    this.setResizable(false);
    jProgressBar1.setMaximumSize(new Dimension(150, 16));
    jProgressBar1.setMinimumSize(new Dimension(150, 16));
    jProgressBar1.setMaximum(100);
    jProgressBar1.setMinimum(0);
    jLabel1.setMaximumSize(new Dimension(374, 32));
    jLabel1.setMinimumSize(new Dimension(187, 16));
    jLabel1.setPreferredSize(new Dimension(187, 16));
    jLabel1.setHorizontalAlignment(SwingConstants.CENTER);
    jLabel1.setText("Patientendaten werden geladen ...");
    jLabel1.setVerticalAlignment(SwingConstants.TOP);
    this.getContentPane().add(jLabel1, null);
    this.getContentPane().add(jProgressBar1, null);
    jLabel1.setVisible(true);
    // Kein Menü in diesem Frame
    this.setMenuBar(null);
    // Größe setzen, sonst gibt´s nur den Überschriftsbalken als Anzeige
    this.setSize(250, 70);
  }

  public void SetValue(int nProzent)
  { jProgressBar1.setValue(nProzent);
  }
}

I call this from my super-class like this:



Fortschrittsanzeige jFortschrittFrame = new Fortschrittsanzeige();
       
Dimension dlgSize = jFortschrittFrame.getPreferredSize();
Dimension frmSize = getSize();
Point loc = getLocation();
jFortschrittFrame.setLocation((frmSize.width - dlgSize.width) / 2 +
 loc.x,
 (frmSize.height - dlgSize.height) / 2 +
 loc.y);
jFortschrittFrame.setVisible(true);
jFortschrittFrame.show();

... but: the text and the ProgressBar doesn´t appear in my window. There is only a white background (and this is set to LightGray with the properties in my JBuilder-design-window.)

Thank´s in advance for your help.