数据库树形控件.基于PB数据窗口技术的TreeView控件。它通过导航的方式自动从数据库中获取数据，而不需任何代码。你只需要指定包含有数据对象的名字（表、主键、外键等）就形了。PB5.0版本，包括使用方法与例子。-database tree controls. Based on the data window PB technology TreeView control. Through the automatic navigation from the database access to data, without the need for any code. You only need to designate a data object contains the names (table, the primary key, foreign keys, etc.) on the form. PB5.0 version, including the use of methods and examples.