adding lowlevel hook to listbox

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53819 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/carbon/private.h

@@ -920,6 +920,11 @@ public:
 
     virtual wxMacDataItem* CreateItem();
 
+    virtual void    ItemNotification(
+                        const wxMacDataItem* itemID,
+                        DataBrowserItemNotification message,
+                        DataBrowserItemDataRef itemData);
+
     // pointing back
 
     wxWindow * GetPeer() const;