Expand

<div id="treeview"></div>
<script>
$("#treeview").kendoTreeView({
  dataSource: [
    { text: "foo", items: [
      { text: "bar" }
    ] },
    { text: "baz", items: [
	  { text: "biz" }
	] }
  ]
});

var treeview = $("#treeview").data("kendoTreeView");
// expand the item with text "foo"
treeview.expand(treeview.findByText("foo"));

// expand all loaded items
treeview.expand(".k-treeview-item");
</script>