Pull request #1644: 无jira任务 声明补充

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

* commit '4b83130bf6f70671f657507395fbaad9634edcec':
  无jira任务 声明补充

typescript/base/single/button/buttons/button.icon.ts

@@ -2,4 +2,5 @@ import { BasicButton } from "../button.basic";
 
 export declare class IconButton extends BasicButton {
     static xtype: string;
+    static EVENT_CHANGE: string;
 }