Custom Cocoa Control, what exactly is this?

Question

There are several applications that use this control. One I think most everyone knows is Xcode, another is AppStar. I am interested to know what control this is and where I can find an open source implementation of it:

"The box thingy within the bounds of the red area where it says Build Succeeded"

One developer said he has seen this called a "Jukebox View", but I cannot find anything anywhere with that name, or anything like it.

Does anyone know what exactly this control is called or if there is in fact an open source implementation?

Answer 1

See Visual guide of AppKit controls? for an explanation of how to explore this question. This is called IDEActivityView. It is not a public class.