title: Symbol not found: _OBJC_IVAR_$_NSScroller._action in High Sierra
body: <p>An application which worked on previous versions of MacOS fails on High Sierra with the following message:</p>
  
  <blockquote>
    <p>dyld: Symbol not found: _OBJC_IVAR_$_NSScroller._action   Referenced
    from:     Expected in:
    /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit</p>
  </blockquote>
  
  <p>What change might lead to this issue? (I am not expert in MacOS development) I suspect <strong>otool</strong> command might help identify changes related to this problem but haven't worked out the right parameters for it yet.</p>
  
  <p>Checking AppKit documentation <a href="https://developer.apple.com/documentation/appkit/deprecated_symbols" rel="noreferrer">https://developer.apple.com/documentation/appkit/deprecated_symbols</a> it says NSDrawer is deprecated, is this related? </p>
  
  <blockquote>
    <p>NSDrawer [deprecated]
        A user interface element that contains and displays text, scroll, and browser views, in addition to other view subclasses.</p>
  </blockquote>