1、准确模拟window TreeView控件外观与行为。 2、从数据库中读取结点结构，理论上可以无限级分级。 3、对每个结点可以定义标题、说明、连接地址、连接目标、结点图标、结点打开时的图标。-an accurate simulation TreeView control window appearance and behavior. 2, read from the database node structure, it could theoretically unlimited-l