diff --git a/src/widget/multilayersingletree/multilayersingletree.combo.js b/src/widget/multilayersingletree/multilayersingletree.combo.js
index d06f1a8c6..f35f25c80 100644
--- a/src/widget/multilayersingletree/multilayersingletree.combo.js
+++ b/src/widget/multilayersingletree/multilayersingletree.combo.js
@@ -33,7 +33,7 @@ BI.MultiLayerSingleTreeCombo = BI.inherit(BI.Widget, {
     render: function () {
         var self = this, o = this.options;
 
-        var cls = (o.simple ? "bi-border-bottom " : "bi-border bi-border-radius ") + (BI.isKey(o.status) ? ("status-" + o.status) : "");
+        var cls = (o.simple ? "bi-border-bottom bi-focus-shadow " : "bi-border bi-border-radius bi-focus-shadow ") + (BI.isKey(o.status) ? ("status-" + o.status) : "");
 
         var baseConfig = this._getBaseConfig();