Override CreateItem so wxListBox can turn its notifications into events.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41687 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/carbon/private.h

@@ -1054,6 +1054,8 @@ public:
     wxMacDataBrowserListControl( wxWindow *peer, const wxPoint& pos, const wxSize& size, long style );
     virtual ~wxMacDataBrowserListControl();
 
+    virtual wxMacDataItem* CreateItem();
+
     // pointing back
 
     wxWindow * GetPeer() const;