title: How to set display ratio between widgets in Qt layout?
body: <p>In a tab page I do have one tree view widget and one tab widget inside the vertical layout, I want to set 60% of screen space to tree view and 40% to tab widget, always. How can I do this in Qt Designer ?</p>
  
  <p>Platform: Qt Creator 2.4.1 / Win 7.</p>