Index: /trunk/src/VBox/Frontends/VirtualBox/src/manager/UIVirtualBoxManager.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/manager/UIVirtualBoxManager.cpp	(revision 74743)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/manager/UIVirtualBoxManager.cpp	(revision 74744)
@@ -1197,4 +1197,11 @@
     /* Create menu-bar: */
     setMenuBar(new UIMenuBar);
+
+    /* Make sure menu-bar fills own solid background: */
+    menuBar()->setAutoFillBackground(true);
+    QPalette pal = menuBar()->palette();
+    const QColor color = pal.color(QPalette::Active, QPalette::Mid).lighter(160);
+    pal.setColor(QPalette::Active, QPalette::Button, color);
+    menuBar()->setPalette(pal);
 #endif