Index: /trunk/src/VBox/Frontends/VirtualBox/src/globals/UIMessageCenter.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/globals/UIMessageCenter.cpp	(revision 45288)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/globals/UIMessageCenter.cpp	(revision 45289)
@@ -617,5 +617,5 @@
                               "ignore this message.</p>"),
                            "remindAboutInaccessibleMedia",
-                           tr("Check", "inaccessible media message box"));
+                           tr("Check", "inaccessible media message box"), tr("Cancel"), false);
 }
 
Index: /trunk/src/VBox/Frontends/VirtualBox/src/globals/UIMessageCenter.h
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/globals/UIMessageCenter.h	(revision 45288)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/globals/UIMessageCenter.h	(revision 45289)
@@ -140,11 +140,13 @@
                          const char *pcszAutoConfirmId = 0,
                          const QString &strOkButtonText = QString(),
-                         const QString &strCancelButtonText = QString()) const
-    {
+                         const QString &strCancelButtonText = QString(),
+                         bool fOkByDefault = true) const
+    {
+        int iOkButton = fOkByDefault ? QIMessageBox::Ok | QIMessageBox::Default :
+                                       QIMessageBox::Ok;
+        int iCancelButton = fOkByDefault ? QIMessageBox::Cancel | QIMessageBox::Escape :
+                                           QIMessageBox::Cancel | QIMessageBox::Escape | QIMessageBox::Default;
         return (message(pParent, type, strMessage, strDetails, pcszAutoConfirmId,
-                        QIMessageBox::Ok | QIMessageBox::Default,
-                        QIMessageBox::Cancel | QIMessageBox::Escape,
-                        0,
-                        strOkButtonText, strCancelButtonText, QString()) &
+                        iOkButton, iCancelButton, 0, strOkButtonText, strCancelButtonText, QString()) &
                 QIMessageBox::ButtonMask) == QIMessageBox::Ok;
     }
@@ -156,8 +158,9 @@
                          const char *pcszAutoConfirmId,
                          const QString &strOkButtonText = QString(),
-                         const QString &strCancelButtonText = QString()) const
-    {
-        return messageOkCancel(pParent, type, strMessage, QString(),
-                               pcszAutoConfirmId, strOkButtonText, strCancelButtonText);
+                         const QString &strCancelButtonText = QString(),
+                         bool fOkByDefault = true) const
+    {
+        return messageOkCancel(pParent, type, strMessage, QString(), pcszAutoConfirmId,
+                               strOkButtonText, strCancelButtonText, fOkByDefault);
     }