iOS Delete Button - Objective C

Question

I was wondering where does one get access to iOS delete button. This is the button that Apple uses to close the iAd window, and for deleting iPhone apps from the home screen, and also the Twitter App uses it to delete the photo that you add to a tweet. Do they just download this image somewhere or is there an option for it somewhere like for the info button, and the detail disclosure.

Thanks

I also found that Growl uses this icon along with Lion's Mission Control...

Answer 1

You can use UIKit Artwork Extractor to extract about any iOS artwork that is not public. Just search for close and you will find several close button png images.