I am trying to create a class which could be a subpanel. It extends JPanel
and implements AdjustmentListener. The JPanel is used here as a container
and it keeps JLabels and JScrorrButtons layouted with gridBagLayout.

This class instantiated in application doesn't work, none of components
(labels and scroolButtons) don't even show up.

[code]

public class parameteManager extends JPanel implements
AdjustmentListener{

  public JPanel pane;
  public JScrollBar scrbF;
  public JScrollBar scrbA ;
  public  JScrollBar scrbC ;
  public JTextField wartF ;
  public JTextField wartA ;
  public JTextField wartC ;

   public parameteManager(int a,int b,int c,int d,int e,int f,int g,int
h,int i, int j,int k,int l,java.lang.String z) {
       scrbF = new JScrollBar(JScrollBar.HORIZONTAL, a, b, c, d);
       scrbA = new JScrollBar(JScrollBar.HORIZONTAL, e, f, g, h);
       scrbC = new JScrollBar(JScrollBar.HORIZONTAL, i, j, k, l);
       wartF = new JTextField ();
       wartA = new JTextField ();
       wartC = new JTextField ();
       pane=new JPanel();
       pane.setSize(500,300);

       GridBagLayout gridbg = new GridBagLayout();
       GridBagConstraints constr = new GridBagConstraints();
       constr.insets=new Insets(2,2,2,2);
       pane.setLayout(gridbg);

//adding components to the panel , to set all constraints needed for
gridBagLayout buildConstraints function is used.
 
    buildConstraints(constr, 0, 0, 1, 1, 30, 2,3,0);
       constr.fill = GridBagConstraints.NONE;
       constr.anchor = GridBagConstraints.EAST;
       JLabel label1 = new JLabel("Faza:", JLabel.LEFT);
       gridbg.setConstraints(label1, constr);
       pane.add(label1);
       //amplituda
       
       //pokaz wart czestotl
               wartC.setEditable(false);
               wartC.setText(""+scrbC.getValue());
               buildConstraints (constr,1,2,1,1,0,0,3,0);
               constr.fill= GridBagConstraints.HORIZONTAL;
               constr.anchor = GridBagConstraints.CENTER;
               gridbg.setConstraints(wartC, constr);
               pane.add(wartC);

               pane.setBorder(BorderFactory.createTitledBorder("Manager
O"+z));

               try {
                           jbInit();
                       } catch (Exception ex) {
                           ex.printStackTrace();
       }
   }

   public void adjustmentValueChanged(AdjustmentEvent e) {
           Object source = e.getSource(); //scrbF scrbA scrbC - zrodlo
zdarzenia
           if (source == scrbF) {
               int value=scrbF.getValue();
               wartF.setText(""+value);
           }
           if (source == scrbA){
               int value=scrbA.getValue();
               wartA.setText(""+value/10);
           }
           if (source == scrbC){
               int value=scrbC.getValue();
               wartC.setText(""+value);
           }
       }

   private void buildConstraints(GridBagConstraints gbc, int gx, int gy,
                                 int gw, int gh, int wx, int wy,int px,
int py) {
       //gbc.insets = new Insets(5,5,3,5);
       gbc.gridx = gx;
       gbc.gridy = gy;
       gbc.gridwidth = gw;
       gbc.gridheight = gh;
       gbc.weightx = wx;
       gbc.weighty = wy;
       gbc.ipadx=px;
       gbc.ipady=py;
   }

   private void jbInit() throws Exception {
   }

}

//the applicaion that uses parameteManger class

public class Chart extends JFrame implements AdjustmentListener{

   parameteManager managerx,managery;
   JPanel contentPane;
   
   public Chart(){
       super ("Chart");
       contentPane = new JPanel();
       contentPane.setLayout(new BoxLayout(contentPane,
BoxLayout.PAGE_AXIS));
     
//contentPane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));

       managerx= new parameteManager(2,0,0,6,60,0,60,100,2,0,0,100,"X");
       managery= new parameteManager(2,0,0,6,60,0,60,100,2,0,0,100,"Y");
       

       contentPane.add(managerx);
       contentPane.add(managery);
       
       setContentPane(contentPane);
       setTitle("Chart");

       try {
           jbInit();
       } catch (Exception ex) {
           ex.printStackTrace();
       }
   }

   public static void main(String[] args){
           JFrame frame = new Lissajous1();
           ExitWindow exit = new ExitWindow();
           frame.addWindowListener(exit);
           frame.show();
}

   public void adjustmentValueChanged(AdjustmentEvent e) {
              Object source = e.getSource(); //scrbF scrbA scrbC - zrodlo
zdarzenia
              if (source == managerx.scrbF) {
                  int value=managerx.scrbF.getValue();
                 
              }
              if (source == managerx.scrbA){
                  int value=managerx.scrbA.getValue();
                 
              }
              if (source == managerx.scrbC){
                  int value=managerx.scrbC.getValue();
                 
              }
          }

   private void jbInit() throws Exception {
       this.setResizable(false);
   }

}

[/code]

what could be wrong with it... maybe it is the case of event handling??
any idaes?