title: How to add files sub icon with Visual Studio Package?
body: <p>I'm writing a Visual Studio extension where I want user to select few specific file in solution explorer. I already moved my command to solution explorer part using .vsct file. Now I would like to mark user selected files with sub icons like AnkhSVN (<a href="https://visualstudiogallery.msdn.microsoft.com/E721D830-7664-4E02-8D03-933C3F1477F2?SRC=Home" rel="nofollow noreferrer">https://visualstudiogallery.msdn.microsoft.com/E721D830-7664-4E02-8D03-933C3F1477F2?SRC=Home</a>) does (see image).</p>
  <p><img src="https://i.stack.imgur.com/leuuw.png" alt="AnkhSVN sub icons" /></p>
  <p>How to do that?</p>