diff --git a/src/plugins/platforms/windows/qwindowsbackingstore.cpp b/src/plugins/platforms/windows/qwindowsbackingstore.cpp
index 04fe558..4981ad3 100644
--- a/src/plugins/platforms/windows/qwindowsbackingstore.cpp
+++ b/src/plugins/platforms/windows/qwindowsbackingstore.cpp
@@ -43,7 +43,7 @@
 #include "qwindowswindow.h"
 #include "qwindowsnativeimage.h"
 #include "qwindowscontext.h"
-
+#include <QtCore/QFile>
 #include <QtGui/QWindow>
 
 #include <QtCore/QDebug>
@@ -88,6 +88,7 @@ void QWindowsBackingStore::flush(QWindow *window, const QRegion &region,
 
 #ifndef Q_OS_WINCE
     if (rw->format().hasAlpha() && (window->flags() & Qt::FramelessWindowHint)) {
+        static int n = 0;
         const long wl = GetWindowLong(rw->handle(), GWL_EXSTYLE);
         if ((wl & WS_EX_LAYERED) == 0)
             SetWindowLong(rw->handle(), GWL_EXSTYLE, wl | WS_EX_LAYERED);
@@ -103,7 +104,13 @@ void QWindowsBackingStore::flush(QWindow *window, const QRegion &region,
         RECT dirty = {dirtyRect.x(), dirtyRect.y(),
             dirtyRect.x() + dirtyRect.width(), dirtyRect.y() + dirtyRect.height()};
         UPDATELAYEREDWINDOWINFO info = {sizeof(info), NULL, &ptDst, &size, m_image->hdc(), &ptSrc, 0, &blend, ULW_ALPHA, &dirty};
+
         QWindowsContext::user32dll.updateLayeredWindowIndirect(rw->handle(), &info);
+
+        const QString fname = QString::fromLatin1("test%1.png").arg(n++, 3, 10, QLatin1Char('0'));
+        m_image->image().save(fname);
+        qDebug() << "wrote " << fname;
+
     } else {
 #endif
         const HDC dc = rw->getDC();
@@ -142,8 +149,9 @@ void QWindowsBackingStore::resize(const QSize &size, const QRegion &region)
                 nsp << " from: " << m_image->image().size();
         }
 #endif
-        m_image.reset(new QWindowsNativeImage(size.width(), size.height(),
-                                              QWindowsNativeImage::systemFormat()));
+        QImage::Format format = rasterWindow()->format().hasAlpha() ?
+                       QImage::Format_ARGB32 : QWindowsNativeImage::systemFormat();
+        m_image.reset(new QWindowsNativeImage(size.width(), size.height(), format));
     }
 }