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/xrc/xh_radbx.h

@@ -28,8 +28,12 @@ private:
     // the items labels
     wxArrayString labels;
 
-    // the items tooltips (some or all elements may be empty)
+    // the items tooltips
     wxArrayString tooltips;
+
+	// the item help text
+    wxArrayString helptexts;
+    wxArrayInt    helptextSpecified;
 };
 
 #endif // wxUSE_RADIOBOX