modeling subclassing along msw, unsubclassing filedialog at end of ShowModal, fixes #12236

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65474 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/nonownedwnd.h

@@ -58,6 +58,9 @@ public:
     bool Create(wxWindow *parent, WXWindow nativeWindow);
     
     virtual ~wxNonOwnedWindow();
+    
+    virtual void SubclassWin(WXWindow nativeWindow);
+    virtual void UnsubclassWin();
 
     virtual wxPoint GetClientAreaOrigin() const;