void MyWidget::changeEvent( QEvent * e )
{
  if ( e->type() == QEvent::WindowStateChange )
  {
    QWindowStateChangeEvent * ce = static_cast<QWidgetStateChangeEvent*>( e );
    if ( (windowState() & Qt::WindowMinimized) && !(e->oldState() & Qt::WindowMinimized) )
      // someone minimize us right now
      hide();
  }
}