说明：  在实际应用中，经常需要根据用户需求来动态创建数据窗，一般方法是这样的。 　　在一个window中加入一个数据窗控件，如dw_new,但是该数据窗没有data object,(空白的)就可以用以下语法来创建
(In practice, often required in accordance with user needs to dynamically create a data window, the general method is this. In a window to add a data window controls, such as dw_new, but the data window there is no data object, (blank) can use the following syntax to create)