这个例子介绍了动态树的使用方法，树的节点从后台获取。

<w:form> 
	<w:tree id="componentTree" border="false" style="height:100%;width:100%;" loadAllNodes="true" /> 
</w:form>

Managed Bean代码，由于是动态树，树的节点数据实现接口TreeDataProvider：

@ManagedBean(name = "IndexBean", scope = ManagedBeanScope.SESSION) 
public class IndexBean { 
	@Bind 
	private UITree componentTree; 
	@Bind(id = "componentTree") 
	private TreeDataProvider treeData = new TreeDataProvider() { 
		public Object[] getChildren(Object userData) { 
			return TreeDataLoader.getInstance().getChildren(userData); 
		} 
		public String getHref(Object userData) { 
			return null; 
		} 
		public String getHrefTarget(Object userData) { 
			return null; 
		} 
		public String getIcon(Object userData) { 
			return ""; 
		} 
		public String getText(Object userData) { 
			return TreeDataLoader.getInstance().getText(userData); 
		} 
		public boolean isCascade(Object userData) { 
			return false; 
		} 
		public Boolean isChecked(Object userData) { 
			return null; 
		} 
		public boolean isExpanded(Object userData) { 
			if ("Demos".equals(userData)) 
				return true; 
			return false; 
		} 
	}; 
	... 
}