-const wxEventType wxEVT_COMMAND_LISTBOOK_PAGE_CHANGING = wxNewEventType();
-const wxEventType wxEVT_COMMAND_LISTBOOK_PAGE_CHANGED = wxNewEventType();
+wxDEFINE_EVENT( wxEVT_COMMAND_LISTBOOK_PAGE_CHANGING, wxBookCtrlEvent );
+wxDEFINE_EVENT( wxEVT_COMMAND_LISTBOOK_PAGE_CHANGED, wxBookCtrlEvent );