title: Automatic Styling/Tinting of NSToolbarItem
body: <p>Is there a way to tell OS X to automatically style/tint a <code>NSToolbarItem</code>?</p>
  
  <p>I've added an "Image Toolbar Item" via IB/Xcode and set the icon to a black PDF <a href="https://developer.apple.com/library/mac/documentation/userexperience/conceptual/applehiguidelines/IconsImages/IconsImages.html#//apple_ref/doc/uid/20000967-TPXREF102" rel="nofollow noreferrer">as described in the documentation</a>.</p>
  
  <p>However, my result does not resemble that of, for instance, the App Store:</p>
  
  <p><img src="https://i.stack.imgur.com/MfwEo.png" alt="enter image description here"></p>
  
  <p>I'm looking for something akin to what the TabBar in iOS does by default.</p>
  
  <p>I'm new to OS X development... So any guidance would be appriciated!</p>