title: Custom NSScrollView doesn't scroll NSTableHeaderView
body: <p>I have an <code>NSTableView</code> embedded within a custom <code>NSScrollView</code> subclass, wherein I sometimes do scrolling programmatically, like so:</p>
  
  <pre><code>[[self contentView] scrollToPoint:newOffset];
  [self reflectScrolledClipView:[self contentView]];
  </code></pre>
  
  <p>When I do this, the <code>NSTableView</code> scrolls fine, but its associated <code>NSTableHeaderView</code> doesn't move with it. If I use my mouse and scroll the <code>NSScrollView</code> normally, however, they move together like they should.</p>
  
  <p>I figure I'm probably just missing a single line somewhere that lets the <code>NSTableHeaderView</code> know that it's supposed to scroll too, but I don't know what that is. Can anyone help?</p>