+class WXDLLIMPEXP_FWD_CORE wxToolBarBase;
+class WXDLLIMPEXP_FWD_CORE wxCommandEvent;
+
+extern WXDLLIMPEXP_CORE const wxEventType wxEVT_COMMAND_TOOLBOOK_PAGE_CHANGED;
+extern WXDLLIMPEXP_CORE const wxEventType wxEVT_COMMAND_TOOLBOOK_PAGE_CHANGING;
+