title: Binding to NSTextField works; binding to NSTextView doesn't?
body: <p>I've got a simple master-detail project with an array of class instances, an array controller providing a selection of a specific class instance, and an NSTableView presenting the array and the selection. My class has an NSString property, and when I bind it to to an NSTextField, everything works great.</p>
  
  <p>However, when I bind the same property to the Value Path field of an NSTextView, it behaves very erratically:</p>
  
  <ul>
  <li><p>Selecting among entries in the NSTableView causes no change in the NSTextView, even though the selected objects have different values for the bound property.</p></li>
  <li><p>Nothing typed into the NSTextView is copied into the property of the selection.</p></li>
  <li><p>The only apparent effect of the binding is that clearing the selection in the NSTableView (e.g., clicking below all of the entries) causes the contents of the NSTextView to vanish.</p></li>
  </ul>
  
  <p>Any ideas?</p>