IMPLEMENT_DYNAMIC_CLASS(wxPopupWindow, wxWindow)
#endif // __WXMSW__
+IMPLEMENT_DYNAMIC_CLASS(wxPopupTransientWindow, wxPopupWindow)
+
+#if wxUSE_COMBOBOX && defined(__WXUNIVERSAL__)
+ IMPLEMENT_DYNAMIC_CLASS(wxPopupComboWindow, wxPopupTransientWindow)
+#endif
+
// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------