--- a/src/FingersDance.Data/Annotation.cs	Tue Nov 10 13:47:58 2009 +0100
+++ b/src/FingersDance.Data/Annotation.cs	Thu Nov 12 16:15:19 2009 +0100
@@ -8,19 +8,31 @@
 {
     public class Annotation
     {
+        private String _id;
         private float _tcBegin;
         private float _dur;
-        private string _gestureType;
+        private String _gestureType;
         private Color _color;
 
-        public Annotation(float tcBeginPar, float durPar, string gesturePar, Color colorPar)
+        public Annotation(String idPar, float tcBeginPar, float durPar, String gesturePar, Color colorPar)
         {
+            this._id = idPar;
             this._tcBegin = tcBeginPar;
             this._dur = durPar;
             this._gestureType = gesturePar;
             this._color = colorPar;
         }
 
+        public String Id
+        {
+            get { return _id; }
+            set
+            {
+                if (value == _id || String.IsNullOrEmpty(value))
+                    return;
+                _id = value;
+            }
+        }
         public float TcBegin
         {
             get { return _tcBegin; }