BI-110891 fix：同步fineui

src/base/1.pane.js

@@ -40,10 +40,10 @@ BI.Pane = BI.inherit(BI.Widget, {
 
     loading: function () {
         var self = this, o = this.options;
-        var loadingAnimation = BI.Providers.getProvider("bi.provider.system").getLoading({ 
+        var loadingAnimation = BI.createWidget(BI.Providers.getProvider("bi.provider.system").getLoading({
             loadingSize: o.loadingSize,
             context: this
-        });
+        }));
         // pane在同步方式下由items决定tipText的显示与否
         // loading的异步情况下由loaded后对面板的populate的时机决定
         this.setTipVisible(false);