diff -r 3b1da2848fc7 -r d3bac044e0f0 src/gui/dialogs/qdialog.cpp
--- a/src/gui/dialogs/qdialog.cpp	Fri Feb 19 23:40:16 2010 +0200
+++ b/src/gui/dialogs/qdialog.cpp	Fri Mar 12 15:46:37 2010 +0200
@@ -265,6 +265,14 @@
     if (!qt_wince_is_smartphone())
         setWindowFlags(windowFlags() | Qt::WindowOkButtonHint | QFlag(qt_wince_is_mobile() ? 0 : Qt::WindowCancelButtonHint));
 #endif
+
+#ifdef Q_WS_S60
+    if (S60->avkonComponentsSupportTransparency) {
+        bool noSystemBackground = testAttribute(Qt::WA_NoSystemBackground);
+        setAttribute(Qt::WA_TranslucentBackground); // also sets WA_NoSystemBackground
+        setAttribute(Qt::WA_NoSystemBackground, noSystemBackground); // restore system background attribute
+    }
+#endif
 }
 
 #ifdef QT3_SUPPORT
@@ -294,6 +302,14 @@
     if (!qt_wince_is_smartphone())
         setWindowFlags(windowFlags() | Qt::WindowOkButtonHint | QFlag(qt_wince_is_mobile() ? 0 : Qt::WindowCancelButtonHint));
 #endif
+
+#ifdef Q_WS_S60
+    if (S60->avkonComponentsSupportTransparency) {
+        bool noSystemBackground = testAttribute(Qt::WA_NoSystemBackground);
+        setAttribute(Qt::WA_TranslucentBackground); // also sets WA_NoSystemBackground
+        setAttribute(Qt::WA_NoSystemBackground, noSystemBackground); // restore system background attribute
+    }
+#endif
 }
 
 /*!