Insert() patch from John Labenski

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@20564 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/motif/combobox.h

@@ -55,6 +55,7 @@ public:
     
     // implementation of wxControlWithItems
     virtual int DoAppend(const wxString& item);
+    virtual int DoInsert(const wxString& item, int pos);
     virtual void Delete(int n);
     virtual void Clear();
     virtual int GetSelection() const ;