title: Standard (?) button in Qt
body: <p>How can i manipulate this button [img 1], which automaticly created in my project?</p>
  
  <p>Interested function: </p>
  
  <ol>
  <li>Delete;</li>
  <li>Open new window with help;</li>
  </ol>
  
  <p><a href="https://i.stack.imgur.com/U5wOt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/U5wOt.png" alt="enter image description here"></a></p>