diff --git a/include/simpleplugin/class_dialogAttributes.inc b/include/simpleplugin/class_dialogAttributes.inc
index 9e00e7ff861698c6e7c462750f95e87ccaaf4134..0fc798cb432e017d4f91b635a4a33ff8b9aa15f7 100644
--- a/include/simpleplugin/class_dialogAttributes.inc
+++ b/include/simpleplugin/class_dialogAttributes.inc
@@ -241,6 +241,16 @@ class DialogOrderedArrayAttribute extends OrderedArrayAttribute
     $this->attribute    = FALSE;
   }
 
+  function getFilterBlackList ()
+  {
+    trigger_error("abstract method");
+  }
+
+  function getFilterWhiteList ()
+  {
+    return array();
+  }
+
   function loadPostValue ()
   {
     if ($this->isVisible()) {