make it possible to associate context help text with individual radiobox items

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39676 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/radiobox.h

@@ -144,6 +144,16 @@ protected:
     virtual void DoSetItemToolTip(unsigned int n, wxToolTip * tooltip);
 #endif
 
+    virtual int GetItemFromPoint(const wxPoint& pt) const;
+
+#if wxUSE_HELP
+    // override virtual function with a platform-independent implementation
+    virtual wxString GetHelpTextAtPoint(const wxPoint & pt, wxHelpEvent::Origin origin) const
+    {
+        return wxRadioBoxBase::DoGetHelpTextAtPoint( this, pt, origin );
+    }
+#endif // wxUSE_HELP
+
 #ifndef __WXWINCE__
     virtual WXHRGN MSWGetRegionWithoutChildren();
 #endif // __WXWINCE__