title: Disable NSSavePanel "Save As:" text input field
body: <p>Stuck at this for some time now.</p>
  
  <p>Does anyone know how to disable text input field on a NSSavePanel? This is how I am using it:</p>
  
  <pre><code>NSSavePanel *panel = [NSSavePanel savePanel];
  [panel beginSheetModalForWindow:window completionHandler:^(NSInteger result)
  {
  ...
  }
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/0xVzG.png" alt="enter image description here"></p>
  
  <p>Any help is really appreciated.</p>
  
  <p>Thanks</p>