title: I cant paint QVideoWidget with QPainter
body: <p>I am trying to draw strings while I have a video palying, like a subtitle...
  I have a Phonon::QVideoWidget, in its constructor I do:     </p>
  
  <pre><code>painter = new QPainter(this);
  </code></pre>
  
  <p>and I have overrided the paint event to this, only for test:</p>
  
  <pre><code>void MyVideoWidget::paintEvent(QPaintEvent* event)
  {
      painter-&gt;drawLine(0, 0, 1, 1);
      //painter-&gt; anything shows
  }
  </code></pre>
  
  <p>So when I start my player I see nothing that QPainter did, only the normal video playing
  any ideas?</p>