title: How to use General and Downloads icon seen in Xcode's Preferences Panel?
body: <p>I have been creating a preferences panel that would pop up when an user taps <kbd>⌘</kbd>+<kbd>,</kbd> in my Cocoa app, and I like to use the same <em>General</em> and <em>Downloads</em> icons that are used in <em>Xcode</em>.</p>
  
  <p><img src="https://i.stack.imgur.com/AqFPJ.png" alt="enter image description here"></p>
  
  <p>However, as far as I know, when I moved <em>Image Toolbar Item</em> from Object Library to the Toolbar in IB and then search for the appropriate <em>Image Name</em> on <em>Attribute Inspector</em>, I cannot find these icons on the list. At first I wonder whether this is available only to Apple's software, but later I found that this same <em>General</em> and <em>Downloads</em> icons are used in 3rd party app, such as Dash:</p>
  
  <p><img src="https://i.stack.imgur.com/xx7M0.png" alt="enter image description here"></p>
  
  <p>Also, the <code>NSPreferencesGeneral</code> in the <em>Image Name</em> is NOT the same <em>General</em> icon as seen in the toolbar above. So how can I can use the correct toolbar icon in my app (which is built in Yosemite)?</p>
  
  <h3>UPDATE</h3>
  
  <p>Strangely, even within Apple's software, there are two types of <em>General</em> icon used. The toolbar below is from <em>Calendar.app</em>, but this is also used in other softwares such as <em>Safari</em> and <em>Terminal</em>:</p>
  
  <p><img src="https://i.stack.imgur.com/jnLWm.png" alt="enter image description here"></p>
  
  <p>This <em>General</em> icon looks like not fully compatible with Retina display. Even worse, the <em>Xcode 6.2</em> uses the cool icon as seen in the first image, while <em>Xcode 6.3 beta</em> uses the awkward icon that is seen in <em>Calendar.app</em>.</p>
  
  <p>Also, the <a href="https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSImage_Class/#//apple_ref/doc/constant_group/Toolbar_Named_Images" rel="noreferrer">NSImage Class Reference</a> displays the same cool icon as seen in Xcode (6.2) and Dash.</p>
  
  <p><img src="https://i.stack.imgur.com/pgzmd.png" alt="enter image description here"></p>
  
  <p>So what is happening here...? Note that I use all of the apps I mentioned in this post on the same operating system on the same Mac. Anyone knows why this occurs?</p>