javascript - Why would a change to a label or icon on a dojo IconMenuItem while the page is running not change the page? -

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when have html set , run js code through web browser iconmenuitem never visually changes icon or label. after js runs , call function on iconmenuitem, direct iconmenuitem.label not empty , iconmenuitem.icon "images/icon.png". how element's values changed visually in browser, iconmenuitem not change?

html:

<script type="text/javascript" data-dojo-config="isdebug: false, async: true, parseonload: true, mblhideaddressbar: false" src="dojo/dojo.js"></script> 

<div data-dojo-type="dojox.mobile.swapview" id="mainpageview"     data-dojo-props="selected:true">      <ul data-dojo-type="dojox.mobile.iconmenu" id="menu"         style="width: 320px; height: 400px;" data-dojo-props="cols: 3">          <li data-dojo-type="dojox.mobile.iconmenuitem" label="empty"             onclick=handlebutton(this) id="btn1"></li>

js:

        require(['dijit/registry'], function(registry) {         var actualbutton = registry.byid("btn1");         actualbutton.label=checkbox.title.substring(2);         actualbutton.icon="images/icon.png";         wl.logger.debug(actualbutton.id+ "'s label now: " + actualbutton.label);     });

try using set method ex. 

actualbutton.set({label:'newvalue',icon:'iconvalue'});

check:http://jsfiddle.net/gxgzg/1/


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