Cocoa round cancel button

Apple uses a small rounded button to cancel downloads and delete inputs in textfields but I can't find it anywhere. I also need the pause and play versions of this button. Here's the cancel button so you se what I mean.

I开发者_StackOverflow've looked for it in the object library in IB and checked all the setting but I can't find it anywhere. It's also used a lot in iOS. Can anyone tell me where to find it?

It's:

[NSImage imageNamed:NSImageNameStopProgressFreestandingTemplate];

(from the documentation).