Index: Radio.cs
===================================================================
--- Radio.cs	(revision 27845)
+++ Radio.cs	(working copy)
@@ -692,15 +692,28 @@
         case SortMethod.Number:
           if (channel1 != null && channel2 != null)
           {
+            int channel1GroupSort = 0;
+            int channel2GroupSort = 0;
+            foreach (RadioGroupMap gm in selectedGroup.ReferringRadioGroupMap())
+            {
+              if (gm.ReferencedChannel().IdChannel == channel1.IdChannel)
+              {
+                channel1GroupSort = gm.SortOrder;
+              }
+              if (gm.ReferencedChannel().IdChannel == channel2.IdChannel)
+              {
+                channel2GroupSort = gm.SortOrder;
+              }
+            }
             if (bAscending)
             {
-              if (channel1.SortOrder > channel2.SortOrder)
+              if (channel1GroupSort > channel2GroupSort)
               {
                 return 1;
               }
               return -1;
             }
-            if (channel2.SortOrder > channel1.SortOrder)
+            if (channel2GroupSort > channel1GroupSort)
             {
               return 1;
             }