private void jbInit() throws Exception {
    JLabel loid, lvalue;

    loid = new JLabel("OID: ");
    lvalue = new JLabel("Value: ");
    lmessage = new JLabel("");
    lmessage.setOpaque(true);

    String oid = util.getOid(sysContact);
    toid = new JTextField(oid);
    tvalue = new JTextField();

    setButton = new JButton("Set");
    getButton = new JButton("Get");
    getNextButton = new JButton("GetNext");

    Vector sw = new Vector(2);
    sw.addElement(setButton);
    sw.addElement(getButton);

    GridBagLayout grid = new GridBagLayout();
    Container cont = this;
    cont.setLayout(grid);

    addToGridBag(grid, cont, loid, 0, 0, 0.33, 1.0);
    addToGridBag(grid, cont, toid, 1, 0, 2, 1, 0.33, 1.0);
    addToGridBag(grid, cont, lvalue, 0, 1, 0.33, 1.0);
    addToGridBag(grid, cont, tvalue, 1, 1, 2, 1, 0.33, 1.0);
    addToGridBag(grid, cont, setButton, 0, 2, 0.33, 1.0);
    addToGridBag(grid, cont, getButton, 1, 2, 0.33, 1.0);
    addToGridBag(grid, cont, getNextButton, 2, 2, 0.33, 1.0);
    addToGridBag(grid, cont, lmessage, 0, 3, 3, 1, 0.33, 1.0);

    lmessage.setBackground(Color.white);

    setButton.addActionListener(this);
    getButton.addActionListener(this);
    getNextButton.addActionListener(this);
    this.addMouseListener(this);
  }
 private void sendRequest(BlockPdu pdu) {
   setButton.setEnabled(false);
   getButton.setEnabled(false);
   getNextButton.setEnabled(false);
   lmessage.setText("Sending request ..");
   lmessage.setBackground(Color.white);
   try {
     varbind var = pdu.getResponseVariableBinding();
     AsnObjectId oid = var.getOid();
     AsnObject res = var.getValue();
     if (res != null) {
       toid.setText(oid.toString());
       tvalue.setText(res.toString());
       lmessage.setText("Received aswer ");
       lmessage.setBackground(Color.white);
     } else {
       lmessage.setText("Received no aswer ");
       lmessage.setBackground(Color.red);
     }
   } catch (PduException exc) {
     lmessage.setText("PduException: " + exc.getMessage());
     lmessage.setBackground(Color.red);
     exc.printStackTrace();
   } catch (java.io.IOException exc) {
     lmessage.setText("IOException: " + exc.getMessage());
     lmessage.setBackground(Color.red);
     exc.printStackTrace();
   }
   setButton.setEnabled(true);
   getButton.setEnabled(true);
   getNextButton.setEnabled(true);
 }