Kendo UI TreeView - Expand all nodes

Expand all the nodes in a Kendo UI TreeView

HTML

<link rel="stylesheet" href="http://cdn.kendostatic.com/2012.2.710/styles/kendo.common.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2012.2.710/styles/kendo.default.min.css">
<script src="http://cdn.kendostatic.com/2014.1.318/js/kendo.all.min.js"></script>
<div id="treeview"></div>

JavaScript

var parentRow=[{ text: "Furniture",items: []}];
var items=[];
for(var i=0;i<5000;i++)
{
   items.push( { text: "childNode"+i,items: [
      {text: "sub child"+i, items:[
      	{ text: "sub sub child " + i, items:[]}
      ]}
   ]});
}
parentRow[0].items=items;
var ds = new kendo.data.HierarchicalDataSource({
    data:  parentRow,
     schema: {
            model: {
                
                hasChildren: function (e) { 
                    return e.items.length > 0;
                },
                children: "items"
            }
        }
});

var treeview = $("#treeview").kendoTreeView({
    dataSource: ds,
    loadOnDemand: true,
}).data("kendoTreeView");

//treeview.expand(".k-item");