title: How do I create a custom UI component with Visual Studio for Mac / Xcode?
body: <p>I am trying to make a custom <code>NSTextField</code> using Visual Studio for Mac and its integration with Xcode.  In trying to work out exactly how to get Xcode to know my <code>CustomTextField</code>, I'm having trouble.</p>
  
  <p>So far, when I try to insert the .h and .m stub files to my project navigator, they seem to create ok.  I can see them in the list of files.</p>
  
  <p>But when I save and return to VS, and then go back to the storyboard file, the new files are missing.</p>
  
  <p>So, how is this done properly?</p>