diff -r b72c6db6890b -r 5dc02b23752f demos/mainwindow/mainwindow.cpp
--- a/demos/mainwindow/mainwindow.cpp	Wed Jun 23 19:07:03 2010 +0300
+++ b/demos/mainwindow/mainwindow.cpp	Tue Jul 06 15:10:48 2010 +0300
@@ -329,7 +329,7 @@
             BlueTitleBar *titlebar = new BlueTitleBar(swatch);
             swatch->setTitleBarWidget(titlebar);
             connect(swatch, SIGNAL(topLevelChanged(bool)), titlebar, SLOT(updateMask()));
-            connect(swatch, SIGNAL(featuresChanged(QDockWidget::DockWidgetFeatures)), titlebar, SLOT(updateMask()));
+            connect(swatch, SIGNAL(featuresChanged(QDockWidget::DockWidgetFeatures)), titlebar, SLOT(updateMask()), Qt::QueuedConnection);
 
 #ifdef Q_WS_QWS
             QPalette pal = palette();