diff --git a/module/product/ui/browse.html.php b/module/product/ui/browse.html.php
index cd021bbd7f..9e09290ea2 100644
--- a/module/product/ui/browse.html.php
+++ b/module/product/ui/browse.html.php
@@ -146,7 +146,7 @@ $fnBuildLinkStoryButton = function() use($lang, $product, $productID, $projectHa
     return item(set(array
     (
         'text'  => $buttonTitle,
-        'icon'  => 'plus',
+        'icon'  => 'link',
         'class' => 'primary',
         'url'   => $buttonLink
     )));
diff --git a/module/program/model.php b/module/program/model.php
index ed56284703..74102c964a 100644
--- a/module/program/model.php
+++ b/module/program/model.php
@@ -1835,4 +1835,36 @@ class programModel extends model
         if($program->type == 'project') return $this->programTao->buildProjectActionsMap($program);
         return array();
     }
+
+    /**
+     * Build tree for dropmenu.
+     *
+     * @param  array  $programs
+     * @param  int    $parentID
+     * @access public
+     * @return void
+     */
+    public function buildTree($programs, $parentID = 0)
+    {
+        $result = array();
+        foreach($programs as $program)
+        {
+            if($program->type != 'program') continue;
+
+            if($program->parent == $parentID)
+            {
+                $itemArray = array
+                    (
+                        'id'    => $program->id,
+                        'text'  => $program->name,
+                        'keys'  => zget(common::convert2Pinyin(array($program->name)), $program->name, ''),
+                        'items' => $this->buildTree($programs, $program->id)
+                    );
+
+                if(empty($itemArray['items'])) unset($itemArray['items']);
+                $result[] = $itemArray;
+            }
+        }
+        return $result;
+    }
 }
diff --git a/module/program/ui/ajaxgetdropmenu.html.php b/module/program/ui/ajaxgetdropmenu.html.php
index 15d0d2a4a6..6396ae763f 100644
--- a/module/program/ui/ajaxgetdropmenu.html.php
+++ b/module/program/ui/ajaxgetdropmenu.html.php
@@ -11,31 +11,7 @@ declare(strict_types=1);
  */
 namespace zin;
 
-function buildTree($programs, $parentID = 0)
-{
-    $result = array();
-    foreach($programs as $program)
-    {
-        if($program->type != 'program') continue;
-
-        if($program->parent == $parentID)
-        {
-            $itemArray = array
-            (
-                'id'    => $program->id,
-                'text'  => $program->name,
-                'keys'  => zget(common::convert2Pinyin(array($program->name)), $program->name, ''),
-                'items' => buildTree($programs, $program->id)
-            );
-
-            if(empty($itemArray['items'])) unset($itemArray['items']);
-            $result[] = $itemArray;
-        }
-    }
-    return $result;
-}
-
-$data[0]['items'] = buildTree($programs);
+$data[0]['items'] = $this->program->buildTree($programs);
 
 /**
  * 定义最终的 JSON 数据。