--- a/Implab/FuncChainTaskT.cs	Wed Apr 15 07:30:20 2015 +0300
+++ b/Implab/FuncChainTaskT.cs	Wed May 06 17:11:27 2015 +0300
@@ -4,14 +4,16 @@
     public class FuncChainTask<TArg,TResult> : FuncChainTaskBase<TResult>, IDeferred<TArg> {
         readonly Func<TArg, IPromise<TResult>> m_task;
 
-        public FuncChainTask(Func<TArg, IPromise<TResult>> task, Func<Exception, IPromise<TResult>> error, Func<Exception, IPromise<TResult>> cancel) : base(error, cancel){
+        public FuncChainTask(Func<TArg, IPromise<TResult>> task, Func<Exception, IPromise<TResult>> error, Func<Exception, IPromise<TResult>> cancel, bool autoCancellable) : base(error, cancel, autoCancellable){
             m_task = task;
         }
 
         public void Resolve(TArg value) {
             if (m_task != null && LockCancelation()) {
                 try {
-                    Observe(m_task(value));
+                    var operation = m_task(value);
+                    operation.On(SetResult, HandleErrorInternal, SetCancelled);
+                    CancellationRequested(operation.Cancel);
                 } catch (Exception err) {
                     HandleErrorInternal(err);
                 }