我怎么检测新列添加到列表视图控件？
mobl的标准库还提供了一些高级的控件，像标签组、主从视图、上下文菜单以及可扩展的列表等等。
The mobl standard library also provides higher-level controls such as TAB sets, master-detail views, context menus and expandable lists.
Selector视图是带有列表控件的简单视图，提供了可供用户选择的URL。
The Selector view is a simple view with a list control with URLs that the user can select.
ExpanderView是一个基础列表项控件，可以用来展开和收起列表项(就像邮件应用里的帖子视图)。
ExpanderView is a primitive items control that can be used for expanding and collapsing items (like the threaded views in the Mail app).
如果元素是一个容器(例如列表或树视图)，它必须具有一个点，单击此点时将导致控件的背景获得焦点。
If the element is a container (such as list or tree view), it must have a point that when clicked will cause the background of the control to be focused.
如果元素是一个容器(例如列表或树视图)，它必须具有一个点，单击此点时将导致控件的背景获得焦点。
If the element is a container (such as list or tree view), it must have a point that when clicked will cause the background of the control to be focused.
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