Work around a multiple inheritance ambiguity

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69544 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/radiobox.h

@@ -89,6 +89,9 @@ public:
     void OnRadioButton( wxCommandEvent& event ) ;
 
 protected:
+    // resolve ambiguity in base classes
+    virtual wxBorder GetDefaultBorder() const { return wxRadioBoxBase::GetDefaultBorder(); }
+
     wxRadioButton    *m_radioButtonCycle;
 
     unsigned int      m_noItems;