<zk>
	<zscript><![CDATA[
		import org.zkoss.zul.DefaultTreeModel;
		import org.zkoss.zul.DefaultTreeNode;
		
		DefaultTreeNode root = new DefaultTreeNode(null,
		    new DefaultTreeNode[] {
		      new DefaultTreeNode("item a"),
		      new DefaultTreeNode("item b"),
		      new DefaultTreeNode("item c",
		        new DefaultTreeNode[] {
	    		  new DefaultTreeNode("item c1"),
	              new DefaultTreeNode("item c2")
		        })
		      }
		  );
		DefaultTreeModel model = new DefaultTreeModel(root);
	]]></zscript>
	
	<tree model="${model}" width="150px">
		<template name="model">
	        <treeitem label="${each}" open="true"/>
	    </template>
	</tree>
	
</zk>