Index: /trunk/src/VBox/Frontends/VirtualBox/src/globals/UIPopupCenter.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/globals/UIPopupCenter.cpp	(revision 71578)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/globals/UIPopupCenter.cpp	(revision 71579)
@@ -26,5 +26,4 @@
 # include "UIExtraDataManager.h"
 # include "UIHostComboEditor.h"
-# include "UIMachineWindow.h"
 # include "UIPopupCenter.h"
 # include "UIPopupStack.h"
@@ -383,5 +382,5 @@
 
     /* Special handling for Runtime UI: */
-    if (qobject_cast<UIMachineWindow*>(pParent))
+    if (pParent->inherits("UIMachineWindow"))
         return QString("UIMachineWindow");