resolve multiple inheritance ambiguity

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69573 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/radiobox.h

@@ -163,6 +163,8 @@ protected:
     virtual WXHRGN MSWGetRegionWithoutChildren();
 #endif // __WXWINCE__
 
+    // resolve ambiguity in base classes
+    virtual wxBorder GetDefaultBorder() const { return wxRadioBoxBase::GetDefaultBorder(); }
 
     // the buttons we contain
     wxSubwindows *m_radioButtons;