// classes
//-----------------------------------------------------------------------------
-class WXDLLIMPEXP_CORE wxMDIParentFrame;
-class WXDLLIMPEXP_CORE wxMDIClientWindow;
-class WXDLLIMPEXP_CORE wxMDIChildFrame;
+class WXDLLIMPEXP_FWD_CORE wxMDIParentFrame;
+class WXDLLIMPEXP_FWD_CORE wxMDIClientWindow;
+class WXDLLIMPEXP_FWD_CORE wxMDIChildFrame;
//-----------------------------------------------------------------------------
// global data