title: how to add a uibarbuttonitem in settings bundle?
body: <p>I would like to add a uibarbuttonitem in the settings bundle in my app. How to implement this? What's more, I want to implement the function dragging the items of settings bundle in my app to adjust the orders of the items. How to implement it? I find the 'General' of iphone settings bundle has such functions.
  Thanks for any help.</p>