Sample: dhtmlxToolbar Button Select Listed Option Image dhtmlxToolbar main page
X
 
<script>
 
    var webBar = new dhtmlXToolbarObject("toolbarObj");
    ...
    // setting an image for a listed option
    webBar.setListOptionImage(itemId, optionId, image);
    // clearing an image from a listed option
    webBar.clearListOptionImage(itemId, optionId);
</script>