// fwd decl
class WXDLLEXPORT wxImageList;
class WXDLLEXPORT wxDragImage;
-struct WXDLLEXPORT wxTreeViewItem;
+struct WXDLLIMPEXP_FWD_CORE wxTreeViewItem;
// hash storing attributes for our items
WX_DECLARE_EXPORTED_VOIDPTR_HASH_MAP(wxTreeItemAttr *, wxMapTreeAttr);