关闭JOptionPane后返回JWindow

Question

当用户想要删除项目或关闭窗口时，我会显示MessageDialog。 当我按如下方式显示对话框时：

else if (e.getSource() == delete_btn)
{
  int result = JOptionPane.showConfirmDialog(AgentFrame.this,
     "Are you sure you want to delete Agent: " + availableAgents_list.getSelectedValue().toString() +
     " ?", null, JOptionPane.YES_NO_OPTION);
  if (result == JOptionPane.YES_OPTION)
  {
    availableAgents_list.removeSelectionInterval(availableAgents_list.getSelectedIndex(),
                                                     availableAgents_list.getSelectedIndex());
  }
}

当用户按下YES或CANCEL时，窗口处理..我需要返回窗口进行操作。