Pull request #2516: 无jira任务，补充描述

Merge in VISUAL/fineui from ~GUYI/fineui:master to master

* commit '5bad2781e59e8b3d1007a8b51da76d7007daddf7':
  无jira任务，补充描述

typescript/widget/downlist/item.downlistgroup.ts

@@ -4,6 +4,11 @@ export declare class DownListGroupItem extends BasicButton {
     static xtype: string;
     static EVENT_CHANGE: string;
 
+    props: {
+        iconCls1: string;
+        iconCls2: string;
+    } & BasicButton['props'];
+
     doRedMark(...args: any[]): void;
 
     unRedMark(...args: any[]): void;