+#ifdef WXMAKINGDLL_PROPGRID
+# define WXDLLIMPEXP_PROPGRID WXEXPORT
+# define WXDLLIMPEXP_DATA_PROPGRID(type) WXEXPORT type
+#elif defined(WXUSINGDLL)
+# define WXDLLIMPEXP_PROPGRID WXIMPORT
+# define WXDLLIMPEXP_DATA_PROPGRID(type) WXIMPORT type
+#else /* not making nor using DLL */
+# define WXDLLIMPEXP_PROPGRID
+# define WXDLLIMPEXP_DATA_PROPGRID(type) type
+#endif
+