title: Ajust QVTKWidget to window
body: <p>How can I make my <code>QVTKwidget</code> to adjust when I make my window expand or shrink?</p>
  
  <p>I have more widgets in my layout. I want them to stay the same, just expand shrink the <code>QvtkWidget</code>. I found some things about the layout, but I can't use it on <code>QVTKWidget</code>.</p>