title: Can't move QDockWidget
body: <p>I want to create a widget that contains several <code>QDockWidgets</code> on purpose of putting it into a <code>QMainWindow</code>. Problem is that if I add <code>QDockWidgets</code> to my <code>QWidget</code> class with <code>layout-&gt;addWidget(dockWidget);</code>(I don't know any other way of doing it) and then <code>setLayout(layout)</code> I can't do anything to the <code>QDockWidgets</code> but dock and undock. I can't move them, I can't position them in another place.</p>
  
  <p><code>QMainWindow</code> has this feature <code>addWidgets</code> that <code>QWidget</code> doesn't have. Using <code>QMainWindow</code> everything works perfect, but I want it to work the same if I add a <code>QWidget</code> object(containing some <code>QDockWidgets</code>) to <code>QMainWindow</code>.</p>
  
  <p>Is there any possibility to make my <code>QWidget</code> fully support those <code>QDockWidgets</code>, and use the on full potential(move, scale, dock, change position)?</p>
  
  <p>Thanks</p>