diff --git a/src/applications/base/controller/PhabricatorController.php b/src/applications/base/controller/PhabricatorController.php
--- a/src/applications/base/controller/PhabricatorController.php
+++ b/src/applications/base/controller/PhabricatorController.php
@@ -526,4 +526,39 @@
       ->setSubmitURI($submit_uri);
   }
 
+  protected function buildTransactionTimeline(
+    PhabricatorLiskDAO $object,
+    PhabricatorApplicationTransactionQuery $query,
+    PhabricatorMarkupEngine $engine = null) {
+
+    $viewer = $this->getRequest()->getUser();
+    $xaction = $object->getApplicationTransactionTemplate();
+    $view = $xaction->getApplicationTransactionViewObject();
+
+    $xactions = $query
+      ->setViewer($viewer)
+      ->withObjectPHIDs(array($object->getPHID()))
+      ->needComments(true)
+      ->execute();
+
+    if ($engine) {
+      foreach ($xactions as $xaction) {
+        if ($xaction->getComment()) {
+          $engine->addObject(
+            $xaction->getComment(),
+            PhabricatorApplicationTransactionComment::MARKUP_FIELD_COMMENT);
+        }
+      }
+      $engine->process();
+      $view->setMarkupEngine($engine);
+    }
+
+    $timeline = $view
+      ->setUser($viewer)
+      ->setObjectPHID($object->getPHID())
+      ->setTransactions($xactions);
+
+    return $timeline;
+  }
+
 }
diff --git a/src/applications/maniphest/controller/ManiphestTaskDetailController.php b/src/applications/maniphest/controller/ManiphestTaskDetailController.php
--- a/src/applications/maniphest/controller/ManiphestTaskDetailController.php
+++ b/src/applications/maniphest/controller/ManiphestTaskDetailController.php
@@ -37,12 +37,6 @@
         ->executeOne();
     }
 
-    $transactions = id(new ManiphestTransactionQuery())
-      ->setViewer($user)
-      ->withObjectPHIDs(array($task->getPHID()))
-      ->needComments(true)
-      ->execute();
-
     $field_list = PhabricatorCustomField::getObjectFields(
       $task,
       PhabricatorCustomField::ROLE_VIEW);
@@ -136,15 +130,11 @@
     $engine = new PhabricatorMarkupEngine();
     $engine->setViewer($user);
     $engine->addObject($task, ManiphestTask::MARKUP_FIELD_DESCRIPTION);
-    foreach ($transactions as $modern_xaction) {
-      if ($modern_xaction->getComment()) {
-        $engine->addObject(
-          $modern_xaction->getComment(),
-          PhabricatorApplicationTransactionComment::MARKUP_FIELD_COMMENT);
-      }
-    }
 
-    $engine->process();
+    $timeline = $this->buildTransactionTimeline(
+      $task,
+      new ManiphestTransactionQuery(),
+      $engine);
 
     $resolution_types = ManiphestTaskStatus::getTaskStatusMap();
 
@@ -337,12 +327,6 @@
           'aphront-panel-preview-loading-text',
           pht('Loading preview...'))));
 
-    $timeline = id(new PhabricatorApplicationTransactionView())
-      ->setUser($user)
-      ->setObjectPHID($task->getPHID())
-      ->setTransactions($transactions)
-      ->setMarkupEngine($engine);
-
     $object_name = 'T'.$task->getID();
     $actions = $this->buildActionView($task);