-#define EVT_TAB_SEL_CHANGED(id, fn) { wxEVT_COMMAND_TAB_SEL_CHANGED, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTabEventFunction) & fn },
-#define EVT_TAB_SEL_CHANGING(id, fn) { wxEVT_COMMAND_TAB_SEL_CHANGING, id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTabEventFunction) & fn },
+#define EVT_TAB_SEL_CHANGED(id, fn) { wxEVT_COMMAND_TAB_SEL_CHANGED, \
+ id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTabEventFunction) & fn, NULL },
+#define EVT_TAB_SEL_CHANGING(id, fn) { wxEVT_COMMAND_TAB_SEL_CHANGING, \
+ id, -1, (wxObjectEventFunction) (wxEventFunction) (wxTabEventFunction) & fn, NULL },