title: NSTextField like control for entering key shortcuts - Objective-C/Cocoa
body: <p>I've seen in some applications the control in these shots that is used to enter key shortcuts. I'd like to know if these are standard (available to everyone) or if these were built by the application's developer. I don't think it is the latter because I've seen this in many apps from different developers. Here are the images:</p>
  
  <p><img src="https://i.stack.imgur.com/3CJ3T.png" alt="Ready to enter shortcut">
  <img src="https://i.stack.imgur.com/a3VA9.png" alt="Shortcut is being entered. If you click the arrow button the text &#39;slides&#39; down to reveal the first image">
  <img src="https://i.stack.imgur.com/q3RN1.png" alt="The shortcut has been entered"></p>
  
  <p>To give one example of an app try Bowtie, though I know there's more that use this.</p>
  
  <p>If this control is standard, could you tell me how to use it (what class, etc)?</p>