follow Craig's answer, but to meet 1.7+ and html standards, use instead
<div id="zoomin" data-dojo-type="dijit.form.Button" data-dojo-props="iconClass:'myIcon'"> <span>zoomin</span> </div>
Or you can decide using the override function
<div id="zoomin" data-dojo-type="dijit.form.Button"> <script type="dojo/method" data-dojo-event="getIconClass"> var regular = this.inherited(arguments); </script> <span>zoomin</span> </div>
mschr
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