diff --git a/include/wx/mdi.h b/include/wx/mdi.h
index 19a8832fb6..78c2f4c3e4 100644
--- a/include/wx/mdi.h
+++ b/include/wx/mdi.h
@@ -123,6 +123,10 @@ public:
     virtual wxMDIClientWindow *OnCreateClient();
 
 protected:
+    // Override to pass menu/toolbar events to the active child first.
+    virtual bool TryBefore(wxEvent& event);
+
+
     // This is wxMDIClientWindow for all the native implementations but not for
     // the generic MDI version which has its own wxGenericMDIClientWindow and
     // so we store it as just a base class pointer because we don't need its
@@ -369,6 +373,21 @@ inline wxMDIClientWindow *wxMDIParentFrameBase::OnCreateClient()
     return new wxMDIClientWindow;
 }
 
+inline bool wxMDIParentFrameBase::TryBefore(wxEvent& event)
+{
+    // Menu (and toolbar) events should be sent to the active child frame
+    // first, if any.
+    if ( event.GetEventType() == wxEVT_MENU ||
+            event.GetEventType() == wxEVT_UPDATE_UI )
+    {
+        wxMDIChildFrame * const child = GetActiveChild();
+        if ( child && child->ProcessWindowEventLocally(event) )
+            return true;
+    }
+
+    return wxFrame::TryBefore(event);
+}
+
 #endif // wxUSE_MDI
 
 #endif // _WX_MDI_H_BASE_
diff --git a/include/wx/msw/mdi.h b/include/wx/msw/mdi.h
index caf235fd56..afef0664a4 100644
--- a/include/wx/msw/mdi.h
+++ b/include/wx/msw/mdi.h
@@ -110,9 +110,6 @@ public:
 #endif // wxUSE_MENUS
 
 protected:
-    // override to pass menu/toolbar events to the active child first
-    virtual bool TryBefore(wxEvent& event);
-
 #if wxUSE_MENUS_NATIVE
     virtual void InternalSetMenuBar();
 #endif // wxUSE_MENUS_NATIVE
diff --git a/src/msw/mdi.cpp b/src/msw/mdi.cpp
index e78625d9f0..309002bb01 100644
--- a/src/msw/mdi.cpp
+++ b/src/msw/mdi.cpp
@@ -698,21 +698,6 @@ void wxMDIParentFrame::OnMDICommand(wxCommandEvent& event)
 
 #endif // wxUSE_MENUS
 
-bool wxMDIParentFrame::TryBefore(wxEvent& event)
-{
-    // menu (and toolbar) events should be sent to the active child frame
-    // first, if any
-    if ( event.GetEventType() == wxEVT_MENU ||
-            event.GetEventType() == wxEVT_UPDATE_UI )
-    {
-        wxMDIChildFrame * const child = GetActiveChild();
-        if ( child && child->ProcessWindowEventLocally(event) )
-            return true;
-    }
-
-    return wxMDIParentFrameBase::TryBefore(event);
-}
-
 WXLRESULT wxMDIParentFrame::MSWDefWindowProc(WXUINT message,
                                         WXWPARAM wParam,
                                         WXLPARAM lParam)