added support for radiobox items tooltips in XRC

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39036 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/xrc/xh_radbx.h

@@ -24,9 +24,14 @@ public:
     virtual bool CanHandle(wxXmlNode *node);
 private:
     bool m_insideBox;
-    wxArrayString strList;
+
+    // the items labels
+    wxArrayString labels;
+
+    // the items tooltips (some or all elements may be empty)
+    wxArrayString tooltips;
 };
 
-#endif
+#endif // wxUSE_RADIOBOX
 
 #endif // _WX_XH_RADBX_H_