-IMPLEMENT_CLASS(wxMemoryStreamBase, wxStream)
-IMPLEMENT_CLASS(wxMemoryInputStream, wxMemoryStreamBase)
-IMPLEMENT_DYNAMIC_CLASS(wxMemoryOutputStream, wxMemoryStreamBase)
-IMPLEMENT_DYNAMIC_CLASS(wxMemoryStream, wxMemoryStreamBase)
+IMPLEMENT_CLASS(wxMemoryInputStream, wxInputStream)
+IMPLEMENT_CLASS(wxMemoryOutputStream, wxOutputStream)
+IMPLEMENT_CLASS2(wxMemoryStream, wxMemoryInputStream, wxMemoryOutputStream)
+
+IMPLEMENT_CLASS(wxZlibInputStream, wxFilterInputStream)
+IMPLEMENT_CLASS(wxZlibOutputStream, wxFilterOutputStream)