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Toolbar doesn't support multi-row mode.

But you define several toolbars that are placed one by one:

<div id="toolbarObj"></div>

<div id="toolbarObj1"></div>

<script>

var webBar = new dhtmlXToolbarObject("toolbarObj");
 webBar.setIconsPath("../images/");
 webBar.loadXML(....);
 
 var webBar1 = new dhtmlXToolbarObject("toolbarObj1");
 webBar1.setIconsPath("../images/");
 webBar1.loadXML(...);
</script>