--- a/Implab/ActionChainTask.cs	Fri Feb 19 18:07:17 2016 +0300
+++ b/Implab/ActionChainTask.cs	Fri Apr 22 13:08:08 2016 +0300
@@ -4,6 +4,15 @@
     public class ActionChainTask : ActionChainTaskBase, IDeferred {
         readonly Func<IPromise> m_task;
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="Implab.ActionChainTask"/> class.
+        /// </summary>
+        /// <param name="task">The operation which will be performed when the <see cref="Resolve()"/> is called.</param>
+        /// <param name="error">The error handler which will invoke when the <see cref="Reject(Exception)"/> is called or when the task fails with an error.</param>
+        /// <param name="cancel">The cancellation handler.</param>
+        /// <param name="autoCancellable">If set to <c>true</c> will automatically accept
+        ///  all cancel requests before the task is started with <see cref="Resolve()"/>,
+        /// after that all requests are directed to the task.</param>
         public ActionChainTask(Func<IPromise> task, Func<Exception, IPromise> error, Func<Exception, IPromise> cancel, bool autoCancellable) : base(error,cancel, autoCancellable) {
             m_task = task;
         }
@@ -12,8 +21,10 @@
             if (m_task != null && LockCancelation()) {
                 try {
                     var p = m_task();
-                    p.On(SetResult, HandleErrorInternal, SetCancelled);
+                    p.On(SetResult, HandleErrorInternal, HandleCancelInternal);
                     CancellationRequested(p.Cancel);
+                } catch (OperationCanceledException reason){
+                    HandleCancelInternal(reason);
                 } catch(Exception err) {
                     HandleErrorInternal(err);
                 }