-class WXDLLIMPEXP_ADV wxCalendarDateAttr;
-class WXDLLIMPEXP_ADV wxCalendarCtrl;
-class WXDLLIMPEXP_ADV wxCalendarEvent;
-class WXDLLIMPEXP_ADV wxComboCtrl;
-class WXDLLIMPEXP_ADV wxCalendarComboPopup;
+class WXDLLIMPEXP_FWD_ADV wxCalendarDateAttr;
+class WXDLLIMPEXP_FWD_ADV wxCalendarCtrl;
+class WXDLLIMPEXP_FWD_ADV wxCalendarEvent;
+class WXDLLIMPEXP_FWD_ADV wxComboCtrl;
+class WXDLLIMPEXP_FWD_ADV wxCalendarComboPopup;