diff --git a/src/case/combo/iconcombo/combo.icon.js b/src/case/combo/iconcombo/combo.icon.js
index 697377cf9..8cb821a1e 100644
--- a/src/case/combo/iconcombo/combo.icon.js
+++ b/src/case/combo/iconcombo/combo.icon.js
@@ -20,7 +20,8 @@ BI.IconCombo = BI.inherit(BI.Widget, {
             adjustXOffset: 0,
             adjustYOffset: 0,
             offsetStyle: "left",
-            chooseType: BI.ButtonGroup.CHOOSE_TYPE_SINGLE
+            chooseType: BI.ButtonGroup.CHOOSE_TYPE_SINGLE,
+            isShowDown: true
         });
     },