public void createButtonPanel(Shell dialog) {
    Composite buttonPanel = new Composite(dialog, SWT.NONE);
    GridData gridData = new GridData(SWT.FILL, SWT.FILL, true, false);
    buttonPanel.setLayoutData(gridData);
    buttonPanel.setLayout(new GridLayout(4, false));

    String buttonAlign =
        System.getProperty("org.pentaho.di.buttonPosition", "right")
            .toLowerCase(); //$NON-NLS-1$ //$NON-NLS-2$

    if (!"left".equals(buttonAlign)) { // $NON-NLS-1$
      Label emptyLabel = new Label(buttonPanel, SWT.NONE);
      gridData = new GridData(SWT.FILL, SWT.FILL, true, false);
      emptyLabel.setLayoutData(gridData);
    }
    okButton = new Button(buttonPanel, SWT.PUSH);
    okButton.setText(Messages.getString("VfsFileChooserDialog.ok")); // $NON-NLS-1$
    gridData = new GridData(SWT.FILL, SWT.FILL, false, false);
    gridData.widthHint = 90;
    okButton.setLayoutData(gridData);
    okButton.addSelectionListener(this);
    cancelButton = new Button(buttonPanel, SWT.PUSH);
    cancelButton.setText(Messages.getString("VfsFileChooserDialog.cancel")); // $NON-NLS-1$
    cancelButton.addSelectionListener(this);
    gridData = new GridData(SWT.FILL, SWT.FILL, false, false);
    gridData.widthHint = 90;
    cancelButton.setLayoutData(gridData);
    if ("center".equals(buttonAlign)) { // $NON-NLS-1$
      Label emptyLabel = new Label(buttonPanel, SWT.NONE);
      gridData = new GridData(SWT.FILL, SWT.FILL, true, false);
      emptyLabel.setLayoutData(gridData);
    }
  }