diff -Naur qt-x11-opensource-src-4.0.1-orig/src/gui/widgets/qmenubar.cpp qt-x11-opensource-src-4.0.1/src/gui/widgets/qmenubar.cpp
--- qt-x11-opensource-src-4.0.1-orig/src/gui/widgets/qmenubar.cpp	2005-08-16 12:41:11 +0400
+++ qt-x11-opensource-src-4.0.1/src/gui/widgets/qmenubar.cpp	2005-10-22 21:29:38 +0400
@@ -1137,6 +1137,24 @@
         }
     }
 
+    // Sergey A. Sukiyazov <sukiyazov@mail.ru>
+    // Make behavior like Gtk2 applications. Activate first menu in menubar (if present)
+    // by pressing F10 or Super_L/R (Win_L/R)
+    if(event->type()==QEvent::KeyRelease) {
+        QKeyEvent *kev = static_cast<QKeyEvent*>(event);
+
+        if(kev->key() == Qt::Key_F10) {
+            QAction *act = d->actionList.at(0);
+
+            if (act) {
+                d->setCurrentAction(act);
+                if(act->menu()) {
+                    d->popupAction(act, true);
+                }
+            }
+        }
+    }
+
     return false;
 }