Program: 51966
Project: 51966
Buggy source:
private void createDialog(){
  Document doc=getDocument();
  Element rootElement=doc.getRootElement();
  XulWindow window=null;
  if (rootElement != this) {
    window=(XulWindow)rootElement;
  }
  if (window != null) {
    frame=(JFrame)window.getManagedObject();
    dialog=new JDialog(frame);
    dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
  }
 else {
    dialog=new JDialog();
    dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
  }
  dialog.setResizable(false);
  dialog.setLayout(new BorderLayout());
  JPanel mainPanel=new JPanel(new BorderLayout());
  mainPanel.setOpaque(true);
  int pad=(this.getPadding() > -1) ? getPadding() : 3;
  mainPanel.setBorder(BorderFactory.createEmptyBorder(pad,pad,pad,pad));
  dialog.setTitle(title);
  dialog.setModal(true);
  dialog.add(mainPanel,BorderLayout.CENTER);
  mainPanel.add(container,BorderLayout.CENTER);
  container.setOpaque(false);
  if (this.header != null) {
    JPanel headerPanel=new JPanel(new BorderLayout());
    headerPanel.setBackground(Color.decode("String_Node_Str"));
    headerPanel.setOpaque(true);
    JPanel headerPanelInner=new JPanel(new BorderLayout());
    headerPanelInner.setBorder(BorderFactory.createEmptyBorder(3,3,3,3));
    headerPanelInner.setOpaque(false);
    headerPanel.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED,Color.decode("String_Node_Str"),Color.decode("String_Node_Str")));
    JLabel title=new JLabel(this.header.getTitle());
    title.setForeground(Color.white);
    headerPanelInner.add(title,BorderLayout.WEST);
    JLabel desc=new JLabel(this.header.getDescription());
    desc.setForeground(Color.white);
    headerPanelInner.add(desc,BorderLayout.EAST);
    headerPanel.add(headerPanelInner,BorderLayout.CENTER);
    mainPanel.add(headerPanel,BorderLayout.NORTH);
  }
  Box buttonPanel=Box.createHorizontalBox();
  if (this.buttonAlignment == BUTTON_ALIGN.RIGHT || this.buttonAlignment == BUTTON_ALIGN.END || this.buttonAlignment == BUTTON_ALIGN.MIDDLE || this.buttonAlignment == BUTTON_ALIGN.CENTER) {
    buttonPanel.add(Box.createHorizontalGlue());
  }
  ArrayList<BUTTONS> buttonKeyList=new ArrayList<BUTTONS>(buttons.keySet());
  for (int i=0; i < buttonKeyList.size(); i++) {
    buttonPanel.add(Box.createHorizontalStrut(5));
    buttonPanel.add((JButton)this.buttons.get(buttonKeyList.get(i)).getManagedObject());
    this.addChild(this.buttons.get(buttonKeyList.get(i)));
  }
  buttonPanel.add(Box.createHorizontalStrut(5));
  if (this.buttonAlignment == BUTTON_ALIGN.START || this.buttonAlignment == BUTTON_ALIGN.LEFT || this.buttonAlignment == BUTTON_ALIGN.MIDDLE || this.buttonAlignment == BUTTON_ALIGN.CENTER) {
    buttonPanel.add(Box.createHorizontalGlue());
  }
  mainPanel.add(buttonPanel,BorderLayout.SOUTH);
  dialog.setSize(new Dimension(getWidth(),getHeight()));
  dialog.setPreferredSize(new Dimension(getWidth(),getHeight()));
  dialog.setMinimumSize(new Dimension(getWidth(),getHeight()));
  if (buttons.containsKey(SwingDialog.BUTTONS.ACCEPT)) {
    this.buttons.get(SwingDialog.BUTTONS.ACCEPT).setLabel(this.getButtonlabelaccept());
    this.buttons.get(SwingDialog.BUTTONS.ACCEPT).setOnclick(this.getOndialogaccept());
  }
  if (buttons.containsKey(SwingDialog.BUTTONS.CANCEL)) {
    this.buttons.get(SwingDialog.BUTTONS.CANCEL).setLabel(this.getButtonlabelcancel());
    this.buttons.get(SwingDialog.BUTTONS.CANCEL).setOnclick(this.getOndialogcancel());
  }
  if (buttons.containsKey(SwingDialog.BUTTONS.EXTRA1)) {
    this.buttons.get(SwingDialog.BUTTONS.EXTRA1).setLabel(this.getButtonlabelextra1());
    this.buttons.get(SwingDialog.BUTTONS.EXTRA1).setOnclick(this.getOndialogextra1());
  }
  if (buttons.containsKey(SwingDialog.BUTTONS.EXTRA2)) {
    this.buttons.get(SwingDialog.BUTTONS.EXTRA2).setLabel(this.getButtonlabelextra2());
    this.buttons.get(SwingDialog.BUTTONS.EXTRA2).setOnclick(this.getOndialogextra2());
  }
  if (this.getBgcolor() != null) {
    mainPanel.setBackground(Color.decode(this.getBgcolor()));
  }
}

Fixed version (ground truth):
private void createDialog(){
  if (getParent() instanceof XulRoot) {
    Object parentObj=getParent().getManagedObject();
    if (parentObj instanceof Dialog) {
      dialog=new JDialog((Dialog)parentObj);
    }
 else {
      dialog=new JDialog((Frame)parentObj);
    }
    centerComp=(Component)parentObj;
  }
 else {
    Document doc=getDocument();
    Element rootElement=doc.getRootElement();
    XulWindow window=null;
    if (rootElement != this) {
      window=(XulWindow)rootElement;
    }
    if (window != null) {
      frame=(JFrame)window.getManagedObject();
      dialog=new JDialog(frame);
      centerComp=frame;
    }
 else {
      dialog=new JDialog();
    }
  }
  dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
  dialog.setResizable(false);
  dialog.setLayout(new BorderLayout());
  JPanel mainPanel=new JPanel(new BorderLayout());
  mainPanel.setOpaque(true);
  int pad=(this.getPadding() > -1) ? getPadding() : 3;
  mainPanel.setBorder(BorderFactory.createEmptyBorder(pad,pad,pad,pad));
  dialog.setTitle(title);
  dialog.setModal(true);
  dialog.add(mainPanel,BorderLayout.CENTER);
  mainPanel.add(container,BorderLayout.CENTER);
  container.setOpaque(false);
  if (this.header != null) {
    JPanel headerPanel=new JPanel(new BorderLayout());
    headerPanel.setBackground(Color.decode("String_Node_Str"));
    headerPanel.setOpaque(true);
    JPanel headerPanelInner=new JPanel(new BorderLayout());
    headerPanelInner.setBorder(BorderFactory.createEmptyBorder(3,3,3,3));
    headerPanelInner.setOpaque(false);
    headerPanel.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED,Color.decode("String_Node_Str"),Color.decode("String_Node_Str")));
    JLabel title=new JLabel(this.header.getTitle());
    title.setForeground(Color.white);
    headerPanelInner.add(title,BorderLayout.WEST);
    JLabel desc=new JLabel(this.header.getDescription());
    desc.setForeground(Color.white);
    headerPanelInner.add(desc,BorderLayout.EAST);
    headerPanel.add(headerPanelInner,BorderLayout.CENTER);
    mainPanel.add(headerPanel,BorderLayout.NORTH);
  }
  Box buttonPanel=Box.createHorizontalBox();
  if (this.buttonAlignment == BUTTON_ALIGN.RIGHT || this.buttonAlignment == BUTTON_ALIGN.END || this.buttonAlignment == BUTTON_ALIGN.MIDDLE || this.buttonAlignment == BUTTON_ALIGN.CENTER) {
    buttonPanel.add(Box.createHorizontalGlue());
  }
  ArrayList<BUTTONS> buttonKeyList=new ArrayList<BUTTONS>(buttons.keySet());
  for (int i=0; i < buttonKeyList.size(); i++) {
    buttonPanel.add(Box.createHorizontalStrut(5));
    buttonPanel.add((JButton)this.buttons.get(buttonKeyList.get(i)).getManagedObject());
    this.addChild(this.buttons.get(buttonKeyList.get(i)));
  }
  buttonPanel.add(Box.createHorizontalStrut(5));
  if (this.buttonAlignment == BUTTON_ALIGN.START || this.buttonAlignment == BUTTON_ALIGN.LEFT || this.buttonAlignment == BUTTON_ALIGN.MIDDLE || this.buttonAlignment == BUTTON_ALIGN.CENTER) {
    buttonPanel.add(Box.createHorizontalGlue());
  }
  mainPanel.add(buttonPanel,BorderLayout.SOUTH);
  dialog.setSize(new Dimension(getWidth(),getHeight()));
  dialog.setPreferredSize(new Dimension(getWidth(),getHeight()));
  dialog.setMinimumSize(new Dimension(getWidth(),getHeight()));
  if (buttons.containsKey(SwingDialog.BUTTONS.ACCEPT)) {
    this.buttons.get(SwingDialog.BUTTONS.ACCEPT).setLabel(this.getButtonlabelaccept());
    this.buttons.get(SwingDialog.BUTTONS.ACCEPT).setOnclick(this.getOndialogaccept());
  }
  if (buttons.containsKey(SwingDialog.BUTTONS.CANCEL)) {
    this.buttons.get(SwingDialog.BUTTONS.CANCEL).setLabel(this.getButtonlabelcancel());
    this.buttons.get(SwingDialog.BUTTONS.CANCEL).setOnclick(this.getOndialogcancel());
  }
  if (buttons.containsKey(SwingDialog.BUTTONS.EXTRA1)) {
    this.buttons.get(SwingDialog.BUTTONS.EXTRA1).setLabel(this.getButtonlabelextra1());
    this.buttons.get(SwingDialog.BUTTONS.EXTRA1).setOnclick(this.getOndialogextra1());
  }
  if (buttons.containsKey(SwingDialog.BUTTONS.EXTRA2)) {
    this.buttons.get(SwingDialog.BUTTONS.EXTRA2).setLabel(this.getButtonlabelextra2());
    this.buttons.get(SwingDialog.BUTTONS.EXTRA2).setOnclick(this.getOndialogextra2());
  }
  if (this.getBgcolor() != null) {
    mainPanel.setBackground(Color.decode(this.getBgcolor()));
  }
}