diff --git a/Rs.Controls/RsTray.cs b/Rs.Controls/RsTray.cs
index 0deed76..d08ee71 100644
--- a/Rs.Controls/RsTray.cs
+++ b/Rs.Controls/RsTray.cs
@@ -520,6 +520,15 @@ namespace Rs.Controls
             set { _Column = value; }
         }
 
+        private string _SN;
+
+        public string SN
+        {
+            get { return _SN; }
+            set { _SN = value; }
+        }
+
+
         private RectangleF _Bound;
         [XmlIgnore]
         public RectangleF Bound