diff --git a/Implab/Diagnostics/TraceContext.cs b/Implab/Diagnostics/TraceContext.cs
--- a/Implab/Diagnostics/TraceContext.cs
+++ b/Implab/Diagnostics/TraceContext.cs
@@ -48,7 +48,7 @@ namespace Implab.Diagnostics {
         }
 
         public void StartLogicalOperation(string name) {
-            LogChannel<TraceEvent>.Default.LogEvent(new TraceEvent(TraceEventType.OperationStarted, name));
+            LogChannel<TraceEvent>.Default.LogEvent(new TraceEvent(TraceContext.Instance.CurrentOperation, TraceEventType.OperationStarted, name));
             m_current.BeginLogicalOperation(name);
         }
 
diff --git a/Implab/Diagnostics/TraceLog.cs b/Implab/Diagnostics/TraceLog.cs
--- a/Implab/Diagnostics/TraceLog.cs
+++ b/Implab/Diagnostics/TraceLog.cs
@@ -34,7 +34,7 @@ namespace Implab.Diagnostics {
         [Conditional("TRACE")]
         public static void EndLogicalOperation() {
             var op = TraceContext.Instance.EndLogicalOperation();
-            LogChannel<TraceEvent>.Default.LogEvent(new TraceEvent(TraceEventType.OperationCompleted, String.Format("-{0} : {1}ms",op.Name, op.Duration)));
+            LogChannel<TraceEvent>.Default.LogEvent(new TraceEvent(op, TraceEventType.OperationCompleted,  String.Format("-{0} : {1}ms",op.Name, op.Duration)));
         }
 
         /// <summary>
@@ -44,7 +44,7 @@ namespace Implab.Diagnostics {
         /// <param name="arguments">Arguments.</param>
         [Conditional("TRACE")]
         public static void TraceInformation(string format, params object[] arguments) {
-            LogChannel<TraceEvent>.Default.LogEvent(TraceEvent.Create(TraceEventType.Information, format, arguments));
+            LogChannel<TraceEvent>.Default.LogEvent(TraceEvent.Create(TraceContext.Instance.CurrentOperation, TraceEventType.Information, format, arguments));
         }
 
         /// <summary>
@@ -54,12 +54,12 @@ namespace Implab.Diagnostics {
         /// <param name="arguments">Arguments.</param>
         [Conditional("TRACE")]
         public static void TraceWarning(string format, params object[] arguments) {
-            LogChannel<TraceEvent>.Default.LogEvent(TraceEvent.Create(TraceEventType.Warning, format, arguments));
+            LogChannel<TraceEvent>.Default.LogEvent(TraceEvent.Create(TraceContext.Instance.CurrentOperation, TraceEventType.Warning, format, arguments));
         }
 
         [Conditional("TRACE")]
         public static void TraceError(string format, params object[] arguments) {
-            LogChannel<TraceEvent>.Default.LogEvent(TraceEvent.Create(TraceEventType.Error, format, arguments));
+            LogChannel<TraceEvent>.Default.LogEvent(TraceEvent.Create(TraceContext.Instance.CurrentOperation, TraceEventType.Error, format, arguments));
         }
 
         [Conditional("TRACE")]