diff --git a/src/case/trigger/trigger.editor.js b/src/case/trigger/trigger.editor.js
index 7243d528f..55ff83884 100644
--- a/src/case/trigger/trigger.editor.js
+++ b/src/case/trigger/trigger.editor.js
@@ -6,10 +6,10 @@
  * @extends BI.Trigger
  */
 BI.EditorTrigger = BI.inherit(BI.Trigger, {
-    _defaultConfig: function () {
+    _defaultConfig: function (config) {
         var conf = BI.EditorTrigger.superclass._defaultConfig.apply(this, arguments);
         return BI.extend(conf, {
-            baseCls: (conf.baseCls || "") + " bi-editor-trigger bi-border bi-border-radius",
+            baseCls: (conf.baseCls || "") + " bi-editor-trigger bi-border-radius " + (config.simple ? "bi-border-bottom" : "bi-border"),
             height: 24,
             validationChecker: BI.emptyFn,
             quitChecker: BI.emptyFn,